I have been taking 20 mg. oxycodone for about 3 yrs. I recently changed pharmacies. the oxycodone they gave me is not the same.The new ones make me feel terrible. anxious,sweaty,very unpleasant. Not at all like the ones I have been taking. Don't now what to do. If I keep taking I feel bad if I don't I go thought withdrawal. no good choice. please help. thank you. Distressed in Oregon.