While this may be remote, it is important to eliminate it from the list of things that could be causing the stomach problems. You mentioned a yeast infection, but didn't mention if it was oral in nature. If she has had a rapid Candida bloom in her mouth, it is possible that this could also involve her throat and in really bad cases even her stomach. If Candida gets that far it can be very dangerous. In all likelihood this is the flu that everyone around me here has right now. But I just wanted this other possibility to be on your radar. Diflucan will clear up the yeast in short order with few side effects. Radiation and antibiotics together frequently yield fungus blooms

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.