losing

hi Im new here I actually started a few months ago but then never did anything with it. I need to lose about 50 pounds. The doctor put me on a medication that made me gain weight and now I gotta lose it. Also I was just diagnosed with have cancer again so I am not smoking anymore either. But this also makes me want to eat all the time. I will take any suggestions that anyone has. Also I am not able to do much for exercise as I am disabled.