Dealing with Anxiety and Paranoia

So a few hours I was on a road trip with my mom and sister to my moms boyfriends house. For the past few weeks I’ve been mostly alone, and I jump at any noise, I’m horrified I’m going to die. I grabbed a knife and screamed at the top of my lungs that none of this could be real, they are going to hurt me again, ext etc. I got into an argument with my sister and I ended up slapping her, now I’m at this house I’ve been very paranoid that I’ll get kidnapped or myrdered or killed. I’ve been having anxiety and panic attacks. I can get through this just kinda sucks t I’ve been selfish, and very afraid about many things, it is what it is.. I’m just trying to figure it out and stay calm..