actually your experience wouldnt be considered straight schizophrenia, it would be classified as "drug induced psychosis" and happens more often than you think. If you think its bad enough, see a mental health professional. Nothing to worry about as long as you recognize that the voices aren't real, that means you are still sane. Just look up a therapist if you think you need to, but it is possible to get "stuck" on a trip for a couple months, both john Lennon and jim morisson have famously talked about experiences similar to yours after tripping.