I have been suffering a severe knee injury for the last 10 months. They have me on 100mcg patches every 48 hours, and 4 percocet 10-325 a day. Nothing is even touching the pain! I put the patch on before bed and I MIGHT get 6 hours of relief the next day, that's it. From what I understand this is pretty strong stuff. What can my PM doc try next, what is stronger than the fentanyl?