I am scared and think that people will harass/beat me.....help!?

I keep thinking about some guys I had a lil trouble months ago and keep thinking that they will harm me.This is not normal ,i know.When I get that feeling I feel like i am burning from inside and it paralyses me.help!!! i have schizophrenia and OCD.I didn't have these feelings b4 ,but I have them now ,after taking Omega 3 fish oil.I though they will help