Do you have a cream for your radiated skIn? Don't put it on before the radiation treatment, but bring it with you and put it on after you come out of treatment, paying particular attention to the folds in the skin, that's where the burns and skin breakdown will be the worst. When the skin breaks, cover it with a nonstick dressing to protect it. You will likely feel fatigue setting in after a week or so of radiation. So, be careful if you intend to drive.
Take the anti- nausea medication when you begin to feel queasy, don't wait. You need to the get ahead of the curve. if the pain media give you constipation, talk to your care team about getting some stool softener and Senakot.
Good luck, you will be able to do it. We are all here to help.