Jumbled, violent, bloody nightmare

Hello, I've had a dream and I can only remember bits and pieces but at some points I was myself and other points I was a man with a wife who was cheating on him with a serial killer and the dream skipped to different scenarios and situations and there were a lot of people and I was being chased in some instances, and felt intense pressure and apprehension as someone was constantly trying to kill me and I had no idea who to trust. There were other people involved who were getting slaughtered and it was very bloody. This dream was full of deception and the "characters" who were people in my dream that I didn't know were very realistic but I never knew who was trying to kill me. In the times I was myself my parents were there and I was worried for them as someone was trying to kill them too.

There was one "scene" I remember and it involved 9 people and for some reason I had to separate these nine people and figure out who was this intensely violent murderer. It was very terrifying.

People were talking to me telling me about instances where people were being killed and I was able to see it and it was very bloody.

It started out normal enough and I was working in a store that was connected to a huge warehouse and somehow it transitioned to this rather intricate plot of violence...

I woke up and I was breathing very heavily and my heart was pounding... I'm just wondering if anyone has any idea why it was so violent.

My dreams are often like that, very detailed and very rapidly shifting and I can only remember bits and pieces.

there was this really odd part where I was in my garage with my parents and outside of the garage doors was the ocean but these two crocodiles came up walking on their hind legs and pulling small boats with them and somehow i knew they were going to try to eat my parents so I wanted to hide them and somehow that led to the separating the 9 people or something...

the weird part was that I knew the motives of the crocodiles because it felt very much like deja vu. As if I had very clearly dreamed this earlier... but I hadn't. If anyone could explain that a bit I'd love to hear what you have to say.

sorry this is so jumbled. I tried to write and I remembered smaller details as I went.