Nobody can say for sure, everybody's different... Med half life, metabolism and duration of being medicated are factors to be taken into account... for me the worst withdrawls were over after about 2 1/2weeks, (although my brain re-adjusting to no meds took 3 months). I was on Risperdal and Prozac for 2yrs and lithium for just under a year (switched from Tegratol). I wouldn't advise cold turkey, but it was definitly worth it for me (unaccommodating pdoc)...

If your pdoc is unhelpful, why not google are start a thread on best tapering practices? Then again, you're already 8 days into quitting, tapering seems like a step backward at this point. Idk... I hope you can sleep soon, maybe try some melatonin to help you snooze. Best of luck