Jen,
it happened to most us. Treatment was a miserable experience - food tasted bad, extreme pain, leaky PEG tubes, weight loss, dehydration, nausea, thrush, trach's are scary for most people, etc. and that's just the physical stuff. We haven't even gotten into the emotional aspects, depression, anger, grieving, etc.

I lost a lot of physical strength and needed to be driven to appointments. This is not typically something one can do on their own. I had to plan on showers when I had the most energy and sit on a chair. Cancer fatigue is a well known side effect of treatment. It's not all his doing. When I would look in the mirror I didn't even recognize myself!

He can have all of these things back but he has to be willing to cope with what's in front of him each day - keeping up with nutritional and fluid intake and keeping focused on a cancer free life after this is over. It's a bump in the road. A couple more months and he'll be out of the woods.

Be an encourager. Give your mother some respite help.