[ElaineM]

I would have the gastro intestinal issues checked out by a health care professional before radiation. Perhaps there is something that will help some of your gastro intestinal issues, so that your body will feel better and you will be able to eat more without discomfort during radiation. You need to be strong for radiation too.
There are various kinds of radiation therapies for breast cancer. Be sure you understand exactly what kind you will be receiving and what the possible side effects are if you decide to go ahead with radiation. Perhaps you will be more comfortable if you get a second radiation opinion before beginning radiation too.
Various creams can be prescribed for skin issues during radiation. Pure Aloe Vera gel is often used for skin issues in Hawaii.