Charlie,

First welcome to OCF, glad you found us, sorry you had to. I was athletic before treatment and also lost a total of 70lbs during the whole process. Where due to issues caused from the treatment I'll never be able to sustain the 210lbs I was before cancer, I've been able to gain 30 of it back and build a great physique. It just took time and figuring out the new normal of my body.

I answered your joint pain issue on your other post, I'm going to lay odds on the hypothyroidism as it is an extremely common issue post treatment and that is a often overlooked symptom. I also suggested getting your adrenals and testosterone levels checked. The hormones tend to go haywire after treatment and can cause issues and slow recovery so get them checked out as well.

Stress, pain meds, antidepressants and rads can all massively effect testosterone production in the body which will slow muscle recovery, getting that checked and addressed can help you get back up to speed a bit quicker.

Best of luck

Eric