Watching myself die brutally.

Hi my names Sam I'm fourteen. I've been having a lot of dreams about murder but this one was the most recent and scarring. It was pretty normal at first me my mom and my sister went to this womans house who knew how to take care of spiders. This dream was from my sisters point of view. We had taranutlas for whatever reason and she wanted us to let them go on her porch. This was all happening in the middle of the night in her green house with a small light on the ceiling. So us all three sat there i don't recall what she was saying to us but after a while she took my sister and mother aside and told them that she would need me in the room seperated from her house. We didnt think anything of it we waited watched the spiders crawl around but then the light went out and it was pitch black. Me(or my sister) and my mom tried to fix it but it was out for good. We broke inside to the house. I looked through the window and I could see into the seperated room. My body was in what looked like an execution chair my arms we held down by metal clasps. I was out my head tilted back and the woman was sticking I think a scalpel in my mouth. Thats when it got horrifying. She finished cutting something in my mouth and my entire head opened up I could see inside my head and the back of my teeth. She then got out a saw and started sawing my body in half blood everywhere. Then I woke up.

Spiders are always conflict with your mother. It sounds like your mother is controlling you through subtle means and you're unable to speak back to her and your sister understands.