I agree with Sally whole-heartedly. Why can't he keep you on both? If he were a good pain specialist he would understand that there are times when just the patch doesn't work and must be supplemented with additional medication (which is where the oxycontin comes in). The oxycontin alone doesn't work all the time and my PS gave me additional meds called (breakthrough meds) when the oxycontin alone doesn't work and I take them with the oxycontin. It sounds like if the patch works at times, but then you have breakthrough pain, you then could use the oxycontin. You could ask what everyone is on and print it out and hand it to him the next time you see him. Good luck, sounds like you need it with this one.
Love,
Hell-yun