Balancing side effects is hard. except for messy bags( I have breast and kidney cancer) I've experienced all of the above, as well insomnia, night sweats, and ROID rage. Speak with your oncologist about what medications you can use. for example I given a prescription for Emend to control nausea, but didn't need, because I found ginger tea and candies work fine. I'm taking Gavaiscon to help with gas and acid reflux, I also tried gas X. Gavaiscon can help with constipation, but I was also told to use colace.
Alas there is nothing I can do about the weight gain. I try to eat as little processed food as possible, watch my sodium, fat, and sugar intake.