my son is 22 years old 10 days ago just out of the blue he has become paranoid, high anxiety, fearful that people are watching him, he accuses me his mom of planning something. will not watch TV has it covered with a sheet... his doctor put him on 10mg of generic Prozac 3 days after systems started.. the paranoia just continues to progress. we have another DR apt tomorrow other then telling the DR watch I m telling you. is there any other kind of test I can suggest the DR do? how can a person go from normal to whatever this is . he has had a drug screen and did test positive for THC. he has smoked weed for several years now and we have never experienced this kind of behavior. he also looses his thought process when talking and will ask that same questions over and over . Example. I told him I called his DR and made an appt Friday at 145 pm. he keeps asking me what time he has to call the dr.. I continue to explain no you have an appt Friday to go to his office and hrs later he will again ask when he is suppose to call. I just want my kid back.