I have had bladder cancer and have had my bladder removed.  I didn’t have any chemotherapy/radiation but I too have gained weight despite eating less.  And it’s not a vanity issue it’s wanting to look better/how I used to look.  So I fully sympathise.  The majority of the weight gain is directly connected to lymph nodes having been removed from my groin.  So not only do I feel uncomfortable with the weight gain but I also have to wear compression hosiery.  Is it possible your struggle is connected to a fluid build up?

Thanks Wendy. My ankles and hands don't feel like they have fluid build up but goodness knows where else fluid hides. I had a full hystorectomy and omemtectomy and my lymph nodes were removed too. Most friends and family think I'm being silly wanting to lose weight but, as you say, I just want to be back to me and wear stuff in my wardrobe. 

The compression stocking must be awful in this weather. I had surgical stocking after my op but only for 4 weeks. I couldn't get them off fast enough last week. I had them rolled up off my feet, to my ankles, through the night too. 

If you need help to keep cool, John Lewis have a fantastic wee fan which is about £12. It has 3 settings when not plugged in and is really powerful for a hand held fan. I've had mine for 3 or 4 years and use it constantly in the summer.