Stage 4 prostate cancer weight gain / low stamina

As the title says, I'm currently Six months away from finishing my prostate cancer treatments and the hormones and steroids, they've had me on have given me a weight gain of about 75 pounds. I have tried to remain active, but it feels like i'm landing a seven forty seven on a bike tire with my knees. Every time I walk and my stamina is almost nonexistent. I barely eat like I used to and I just don't know what to do. I've never been this heavy before and feel like I'm carrying an extra person. How do you lose weight when you're barely eating? And you have no stamina, but you want to keep moving to lose the weight. I even tried getting ozembic or something like it through my doctor of course, insurance won't cover it unless I actually physically have diabetes, which I don't.