Charlie

I know the feeling. I went from running Marathons in 3:15 to 3:30 range, lifting my former body weight (177), doing kickboxing for an hour, then ab class and yoga to looking at a scarecrow in the mirror. I only lost 40 pounds the first time, but after the recurrence I was discharged from the hospital at 119 lbs.
Good news is that two and half years later, I'm 142 and lifting the same weights I used to before the cancer. For me the key was getting on thryoid medication - my TSH level had gone up from 1.6 before cancer to 4.3. Now one pill a day and I have the energy I lacked. I'd get that checked.
So between Eric, Brian and myself you can see that hormones are really the key here to recovery.
Keep the Faith
Charm