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You should get down to 2 x 75 mg daily dose for 3 days, then 1 x 75 mg daily 3 more days and then stop
no will not cause withdrawal
Usually 2-3 weeks
sleep disturbance, anxiety may be experienced
Too many questions in one thread --hard to give you exact opinion without examining you or reviewing your full medical records.
I can only say, stopping quetiapine the way I suggested will not cause withdrawal symptoms usually.
It is better to discuss with your doctor remaining concerns for better care.
I think you should see a psychiatrist --as quetiapine is not a right choice for you