Hi, there.  I'm sorry things aren't going very well for your son.  Before I say any more, Health Central has specific sites for ADHD and Schizophrenia which you might find helpful.  It's possible that your son has both, but it's also possible that there was a mis-diagnosis.  Psychotic episodes are basically breaks with reality, like your son feeling that people are out to get him.  I would forget about the word "crazy" because it isn't helpful.

I have a 33-year-old son with autism and developmental disabilities who also suffers from depression and psychotic-like characteristics.  He takes Abilify for the latter and when he isn't on it, he is very paranoid, thinks people are talking about him or are trying to trick him.  His autism keeps him from being very social, although he's willing to go along with others' suggestions.  He has a good job that he was fortunate to get and is high functioning enough to live in his own apartment, with minimal assistance from others.

I really do sympathize with what you are going through.  We had a lot of different experiences with our son; in fact, he wasn't diagnosed with autism until he was in his early teens so we were really in the dark about what was going on with him.  We knew he was developmentally delayed, but that's a big bucket.  Then, throw in depression with that and it was very frustrating because mental health professionals didn't know what to do with him.  We have since found people with experience in these areas, but it feels like we have to be on our toes for any changes we might see in him.

Please don't be afraid to call the doctor if you have questions.  Ask questions.  God knows we get precious little time with doctors nowadays and it's hard to remember to ask everything.  You may not get an answer the same day, but if he's any good, he'll get back to you.  I wish you and your son all the best.  It's important to take good care of yourself, too.  Hopefully, you're on the right track with this doctor.  Medications act differently on people, too, so if what he's taking now isn't doing the job, don't despair.  Sometimes it takes trying more than one to see what works best.