Katie, I went right to Oxycodone and finally a fentanyl patch in the last few weeks. You might try escalating as Paul suggests (although to the best of my knowledge Percocet is just a combo of Oxy and acetominphen and is far stronger than Tramadol).

For mouth sores, and I had plenty, I swished viscous lidocaine around for a full 10 minutes before I tried to eat, that is drink, anything. I also used Caphosol and another saliva inducer whose name escapes me. But baking soda rinses are also very helpful.

Keep us informed about how it goes. You're doing great!