Occasionally once every couple months I'll have break down level paranoia where I believe even family and friends have a plot to kill me. It's not often but it's scary when it does happen. I used to abuse heavy stimulants, so I'm wondering if this is residual stimulant psychosis, ptsd, or bipolar with paranoia (I've had that thrown at me)
Sounds like paranoid schizophrenia caused potentially by stress and bipolar mania. Essentially your brain cant tell what information is important but it senses something is really important leading you to rationally try to draw connections to understand what is so important.
Most likely you need to figure out a medication combination that works w u and also keep a tab on your mental health, stress and sleep ! Stay healthy and take care of yourself!