I mean I know you can’t answer that definitively but can a single shadow of psychosis cause brain damage, and it this common? 

I may have been slightly predisposed to bipolar disorder or another psychotic disorder (but no one in my family is actually  diagnosed diagnosed, though they have some symptoms here and there). However, I believe my first and only delusional episode 3 years ago was mainly drug induced (amphetamines), as well as fueled by stress, anxiety, overthinking, falling in love for the first time, an overactive imagination and some past trauma. 

My delusion was non-bizarre and did not make me a danger to myself or others (perhaps due to how inhibited I was). It was also very elaborate. I was extremely secretive about it (because I knew people would think I was crazy if I tried to explain) so it went on a long time (months) before being noticed. It mostly involved believing someone who I knew in real life was in love with me/obsessed with me and communicated in a coded way in his emails and lectures, etc. It also involved believing I was being hypnotized and possibly in danger.

However it wasn’t hard to let go of when I was mentally in a better place. 

Three years later I’m struggling a lot. I have no psychotic symptoms whatsoever and I have only been diagnosed with depression. But the worst symptom I’m experiencing right now is avolition and apathy and executive dysfunction. Is this related to the episode? 

Thanks.