Can weed make you go crazy?

I have been a pott smoker for quite sometime. And for some reason there have been 4 times were I have had really bad trips off pott. Well this May Run I smoked some with my girlfriend and it was like I was tripping of Acid or something it was like I had all these uncontolable scary thoughts in my head and now even after the fact that I have smoked it I still get these bad thoughts and there always on my mind… What do I do.?