weed that makes you insane?!

so about two months ago my friend moved away, but the week before he did i went to his house and he had marijuana and wanted to know if i wanted to try it. the only reason i did it is because i wanted the last day id be with him to be one you cant forget.. bad idea.. it had to been laced or something, for the next 4 hours we were going insane having the worst trip ever, and then a month later i start getting bad memory loss, blurred vision, diagnosed with ADD, and many more problems, i have to take medication for ADD but i have stopped to see if things would change, when i started taking the medication anytime after it i question my existence, i constantly feel like im going to wake up from a dream, if i close my eyes for to long i dont see black but i will see random blurs and figures and shapes, and i wont remember what ive looked at, basically i am a walking zombie, and i always feel dead.. could this be ADD related or could this marijuana maybe have really messed me up? either way i just wanna know if i can get this to stop, its over whelming and quiet depressing...