Paranoid, what could it be?

Hello everyone.

For many months I've been feeling paranoid and a having a lot of thoughts that I don't want to have. I always feel like I have somebody with me, like men watching me in my house. There were a couple of months I was legit scared to be alone at home because I would claim I would see a huge man at my home. I knew it wasn't true and it was all in my head but I was still very much afraid, to the point that I couldn't do basic things. I couldn't sleep, I was too scared to be sleeping and being watched. I was scared someone was behind the bed or in the house. I would always go from room to room to search for someone. Not only that, but the intrusive thoughts were and are bad too. I can be walking down the street and I'll be thinking awful things like a car passing by and I'll think it will destroy my. Or sometimes I think i should take knives and put them inside me. Even worse things.

I used to take pills to control my humor since I have BPD, I took 2, but since these were so frequent I began to think it could be from the pills, even tho I've had this before, they became stronger. I started to take just 1. I honestly don't want to continue the medication since it might be just the meds and shit that happened in my life this year. But I honestly don't know if i have something else other than BPD. I'm beginning to think I might have something else too.