Need advice , please help. Psychiatrist?

5 years before i took ganja (cannabis) when i was in great deprsn. I lost all my brain power. no imagination power, nearly dead brain, i was not able to speak also. I took treatment from many psychiatrist, some medicine worked with side effect, some gave me panic attack. I was totally a patient of schizophrenia or worst than that. my health improved in 3 years a little but i was not able to go out of my home bcz voices was making my brain again dead type. But after 3 years , i got a psychiatrist(pres. attached) who gave me medicines , i was not able to trust him ,but i took those medicines and taking till now. i improved a lot , now i can speak, walk , drink, smoke etc. but todays date i am not doing any Nasha or drug. Only nicotex for cigg. But 10 days before i took dezula 20 , so it gave me a panic attack with bloating , i was already facing bloating. so my stomach is also upset now. Today i am so depressed and my brain is not working like 1 month b4. Should i change my psychiatrist?