Do not lose hope. Drug switching is considered as a good thing because the doctor is making the best out of it (they even look at the color of your palm to get an idea how your body is responding to meds.) All I can suggest is to be patient. You seem out of luck because you had to hop around this many times.

It takes years to be diagnosed with a mental illness
(scroll down to Diagnostic criteria for schizophrenia (USA criteria).)

Please be patient and stick to one psychiatrist and one therapist. Or at least try to.