I admit I didn't read the whole thread, so this may have been said already.
Weed when used in adolescence increases your chances for developing a form of psychosis in your 20's by about 10x.
I know exactly what you mean, I was recently diagnosed with schizoaffective disorder (a form of schizophrenia) and that's how it is for me pretty much all the time. So I understand how much it sucks, but at least be thankful you aren't hearing voices all the time like me. I constantly feel like there's someone standing right behind me.
I just try to mind over matter the whole situation, there really isn't anything to worry about. Your brain is just trying to fuck with you.
Remember that.
[Edit: Even though smoking weed when I was young is probably what caused it, it also helps me out a lot. It doesn't make the hallucinations go away, but it makes it easier for me to just laugh at them because they're not real. That new Quizno's commercial for the $1 Sub Sale is fucking hilarious.
"REAL?! I'll tell you what's real Brian! Your second sub for only a dollar! Let's feast."]