Hang in there. My first cycle of Sutent was rough. My tongue was so sore that I could not eat. The second cycle the Dr. put me on Protonix 40mg and Zantac 150mg. I have not had mouth sores after the first month. I am not sure what dose you are on, but after 2.5 cycles of 50mg I was switched to 37.5. Still hard but doable. My Dr. has changed my dosing to two weeks on one week off, as the side effects are so strong after the second week. This is the fist cycle at this protocol and I can't wait till day fourteen. So talk to your oncologist and don't give up. I have to add that I have a lot of prayer support. I don't think I could have gone through this with out it. Blessings, Robbie