Hi, I have been on Percocet 10/325 along with Neurontin, Flexeril, Valium for about a decade. I was switched to 75 MCG Fentanyl patch 2 weeks ago. Valium was stopped 3 weeks ago. The 1st week I could not sleep at all. Drowsy, though. Shaky, cold. My doctor said it was withdrawal. Now at week 2, I sleep about 2 hours, very shaky, freezing cold, (I never get cold) Absolutely miserable BUT have great pain relief. Must stay in bed. I would not be able to dress or pick up next month prescription in this condition. My other opinion is nothing. I have severe Intractable Pain. My doctor is also on vacation for the next 2 weeks.