I have been taking 16mg of suboxone for about 9 months now, I currently have a really bad kidney stone isssue and need pain killers. My sub doc told me to stop and start taking the percocett and its on the 3rd day now and I still cant really feel the effects of the percocett.. Still in ALOT of pain and he says hang in there it will get better.. How long before I feel the percocett to ease any pain I have?