Hello ali,A had daily radiation for 30 days and first 2 weeks went smooth after that skin burns and mouth sores started,for skin I used pure coconut oil and mouth sores I rinsed with salt and baking soda upto 10 times a day I don't know if you gonna have feeding tube or not but mske sure you take in plenty calories to maintain weight. You can find high calory milk shake formulas here just read as many posts as you can that what helped me.goodluck