Hi camhad
Although quitting weed is not fun, it's bearable. The more time that goes on the better you should feel.
I think it's probably time to take a good look at your life tho - whats gonna happen when you go back to school? are you gonna hang around the same kind of people or not?
If you keep getting addicted to stuff, have you thought about seeing a teacher/counsellor at school for help? a Dr? even your parents?
D