I’m 55, and trying to do the same! Swimming everyday is my go to (bad knees). Diagnosed 5/24, dmx 8/24, finished radiation 11/24, ovaries removed 12/24 and the fatigue was unreal. Slowly started swimming each day and changing daily eating habits. I agree with @celestebradham my insurance company provided great support with weekly to biweekly check ins with nurse, nutritionist, weight coach, etc. am up to swimming about min of 1 hour a day. Am also finding going to bed earlier has been a must and game changer. Doing my best to drop the weight and get new knees! Hang in there and know you are not alone in this new season of changes. Keep the faith! You’ve got this!