i was on 2mg of xanax before my hip replacement. I now stop taking percocet for hip replacement surgery. I am on day 7. I believe that the worst is over, but i am still very anxious and i am having extreme trouble sleeping at night. I continue the 2mg regiment of xanax all though this surgery and percocet detox. I was on percocet for six weeks. What can I do so i can sleep normally again.