I had those kinds of thoughts and my T called it hypervigilance. I would check my car convinced someone was hiding in the backseat waiting. I couldn't go to the dumpster at night because I just knew someone was inside and going to attack me. Which are absolutely ridiculous ideas....but I was certain of them. I used to be in an abusive relationship and watched my parents fight constantly. And with therapy and talking through all of those complicated emotions and him making me realizing how those things would never actually happen....I eventually quit having them. It took several months of therapy but I feel so much better now.