Radiation enteritis symptoms and conditions

I do have bowel problems because of radiation enteritis (had abdominal radiation 17 years ago). On Fosamax I had stomach problems so bad that I had to be put on IV's to rehydrate. My problem now is last summer I had breast cancer, and my doctor is running me through aromatase inhibitors; two of which have already caused the same reaction (pain, vomiting, diarrhea, etc.) Both times ended with me back on IV's. Does anyone have any thoughts on this? I'd love to hear from you.