I didn't have chemo. Just radiation. 35 treatments. I was 250 lbs when dx and 210 at the end. Surg. teeth pulled and radiation. You will make it! I didn't have any tubes during radiation. There is mouth wash to help with the nausea and mouth pain. Take the pain meds! worry about addiction later. food and water are you medications they are just as important as your treatments. Also protein powder is you friend! You'll do great!