What are losing a body part dreams about?

Hey people, this isnt really a nightmare story or at least I don't know if it was, that was the question i thought might be answered.
So basically i just woke up out of nowhere at 9am. I dont know how but instinctively stood up and looked by my bed, I vaguely remember feeling something on my knee but i'm not even sure. When I stood up i saw a giant ass spider. Like maybe 3 inches leg to leg, it was bigger than most spidersthat live in my country. Following initial fear I grabbed my shoe and tried to hit him with it. I remember seeing in the half dark room that his body dropped on the floor but when i turned the light on nothing was there not evem a lost leg. And my first thought after that was "was that real or was I still dreaming?" I woke up my family trying to see if the spider is still around somewher and couldnt find anything.
Could things like that be a dream or is there actually a giant spider under my bed? The thing that points to it being a real event is that I fell asleep at 4am and somehow woke up without hesitatiom at 9am, this never happens to me unless I am disturbed sumehow and even then i never jump right up from sleep. I dont know if it was a dream or reality and I gotta say i'm lil bit scared to go to sleep again.
Any thoughts? Could someone dream something like this?

Last night I dreamt I was with a man I have feelings for and who also has feelings for me but we're not together yet. And he's really afraid of spiders. In the dream, we were outside somewhere and I saw a big hairy spider with only 4 legs. All its remaining legs were on the right side of its body, it had no legs on the left side. I'm not afraid of spiders, and I looked at it for a minute and felt sad for it. Then I pointed it out to him and said "Look, this spider only has 4 legs." And when he saw it, he got freaked out and mad at me and said "Why would you show me that???" Lol in the dream, I had forgotten he was afraid of spiders.

Any input is greatly appreciated :))

Basically my dream was: I was in a plain, with people I don't recognize but who were my friends, I was missing a leg for some reason but somehow I managed to walk normally. Then, all of a sudden, my family decided to build a fucking mansion in a village (idk where). I didn't even ask myself where all that money came from. Then my brothers and me went to the local hardware store to buy some heat isolation materials, we came back walking through a hole filled with nettles. I walked in them with no trouble because I only used my missing leg (how???) to walk in them, so I didn't feel any pain. We came back to the mansion, it was somehow already finished. Then, I found myself with my brothers in one of the rooms of the fucking mansion, and we somehow managed to melt fucking metal in a cauldron, using fucking magic. In a room with full wooden walls. We eventually spilled shittons of metal on the wooden ground, and nothing got set afire for some reason. Then we opened the small window that was in the room, because it began to get really hot in there, and as we opened the window, a swarm of hornets spawned from nowhere. Then I changed myself into another horned (???????) and defeated the hornet leader, after dying two times to him and respawning.

Trigger Warning: Suicide.

This dream was last night - I moved into a new apartment and found out the young lady there before me had committed suicide, because she was haunted by a demon that pushed her to kill herself.

Long story short I ended up getting the demon and the stuff it would do and say to me was so horrifying I didn’t even know I could think like that. Even neighbours who were also possessed by the demon had missing arms, legs and eyes from self mutilation.

Before I had this dream, I woke up sweating in the middle of the night, which never happens to me. The whole experience was just awful. I have no idea why this all happened, that was a dream that makes me genuinely worry about future ones.

1.The beginning part of the dream is foggy. But I was a slave. My sole purpose was to be beaten, starved, mentally destroyed. I have never felt that way my whole life. I couldn't trust a single human being to free me from this dark corner of a vast house I was in. I believe I was South American in my dream. In RL I am not South American.
I escaped through the back door where an old lady was standing. She was the mother of the guy that owned the house. She wanted to let me free. There was a steel bowl of water in front of the back door. The water was for the dogs. There was fruit floating in the water. I moved the bowl of water off to the side which spilled some water on the floor. I was terrified. I thought my world would end right then because I spilled the water. The old lady was angry about the water but wanted me gone more than anything.
I ran through the yard. Hopped the wall. Ran into a decrepit village behind the mansion. But everyone knew who I was. No one would help. I kept running. I knew I had less than nothing to live on. But it was freedom.
They found me. I was hiding behind a black marble slab I believe was a bathroom stall. They all treated me like a run away dog. I was crying and pleading. It fell upon deaf ears that mocked me. And as they dragged me back all the villagers acted like I was nothing. The guy that owned the house owned everyone.
2.They brought me back to the house. I was bound on the driveway with arms and legs behind my back. The main guy took a hand drill with a thin 6" drill bit to my chest and drilled into where the bottom of my lungs were. Doctors immediately patched me up. He then drill into my stomach on either side with a larger and much sharper bit. It tore through my stomach muscles 4 times. The doctors patching me up after each injury. I felt my mind breaking. I lost all hope. I lost myself.
3. I was in a clinic. Supposedly free. Seeking help. There was a nurse that wanted me to go into a back room and wait for a doctor. I refused. I thought it was a trapped and they would kidnap me back to that house. There were 2 others like me in the waiting room. One male one female. The female went in. The male tried to calm me down. His hands were both deformed. Missing fingers. It was clear his hands had been crushed by a belt. His hands were narrow across the middle section. Fully healed but seriously deformed by torture. There was some mkultra ptsd talk.

6am the alarm goes off and I have to work as though I haven't seen some shit I've never seen. I'm afraid to sleep tonight.