The oncologist is the doctor to talk to about what this pain might mean in the bigger overall picture of your cancer, but your regular family doctor can help you deal with the immediate crisis. If a doctor says there are no problems with using heat, you could try an electric heating pad or hot water bottle to see if that gives you some relief. If it does, you could try the chemical heat strips that adhere to your clothes to give you long-lasting heat therapy while you are up and moving around. They are made of the same chemicals as the hand and foot warmers sold for outdoor use in the winter, but they have a sticky adhesive to put them where the pain is. Do check with a doctor though to make sure you don't have any medical issues that would make these dangerous. You are not supposed to sleep with a hot pad, so at night, you might experiment with pillows to get you propped into the most comfortable positions. I found several small pillows usually worked better than one big one.