Hello Judi! I believe that most women gain some weight during chemo. Part is due to some of the premeds that are given as they are a form of steriod. My onco told me not to worry about the weight gain. She didn't want me attempting to lose the weight. Her main goal was getting me well. I also found that I did well w/ the fattier foods. Also lots of veggies. As for diet pills, I am not a believer in them. They scare the heck out of me. Always check w/ your onco or pp before you take any type of meds, esp. when you are on chemo.
Hang in there. Remember if it means you gain a few pounds over the next few months to help you get well, don't fight it. You can always lose it after you get the great words "ALL CLEAR"!