Yeah if it were one of my delusions I would immediately assume the docs were lying for some reason maybe they were in league with whoever...maybe they didn't want me to know that half my brain was already gone or maybe they actually showed me a pic of somebody else's brain so I would think everything was OK. Actually I don't think a lot of outright brain damage causes psychosis it usually causes loss of function not gain of stuff like hallucinations and even the medical/neurological causes are typically like very boring hallucinations like spots and auras but not people or animals or other stuff that moves...now epilepsy I think it's reasonable to get and EEG to rule that out because it's electrical and and not structural...and those hallucinations can be anything and it's very real...