How Long Will I Feel This Way...? About A Month

How long will I feel this way...? About a month ago I smoked weed (also i took Celexa that day cuz I just started on it & also on medicine for schizophrenia that I've been on for awhile) and it was a big joint. Afterwards I started hyperventilating felt light headed couldn't think was hallucinating. After an hour I felt better except I still couldn't think very well. And I felt stupider and couldn't understand or make sense of people when they would talk. Or when I read things I can't make sense of it I feel dumb. I've been feeling this way for a month will it ever get better? I've been the doctors and he said there's nothing he can do.. Can someone help me please?