I'm always looking for a solution...

I'm pretty sure my body doesn't always recover from practice on the previous day. When this happens, I feel like the living dead. Can't think. Hands are stiff and sore. Easily irritated. The first thing on my mind is when I can take a break to rest and when I will be able to sleep. Things that were easy become difficult. "Am I going to take those stairs? That's going to kill my feet and they already hurt." My body and mind does not feel fresh and springy.
I think it may just be part of getting old which sucks of course. If that's true, there's not a whole lot I can do and the only thing I might do is manage it.
I've been watching things and have found these things are the biggest factors...
Sleep -- The last cycle of sleep. I can get by on less sleep and can function pretty normally for a few days. But without that last cycle, that last hour or two that I can function without, my body doesn't repair the parts involved in playing an instrument.
Energy in general -- And that seems to be what it's all about. The body having the energy to recover from practicing wear and tear from the previous day. If I'm out running errands all day, out at work, that uses up energy that might have gone into repairing the body and mind from practicing.
Stress -- Another energy one. If my mind is spinning worrying about something, it's burning up energy. As a solution, it's good not to worry, but then again there are things that I should be worrying and thinking about, the life-steering choices that come up from time to time. I have found anger can be useful for getting things done, but it seem short-lived and burns up a lot of energy, leaving me feel drained afterward.
Nutrition -- Eating the right foods so you have that long-term reserve of things when you're working.
I just find daily life is wearing me down more and more as the years roll along. I'm thinking there's not much I do against it. But instead of running around trying to do lots of things, I may just be wearing myself out, doing a lot but never being able to build up on what I did because my body can't recover from the previous day. If that's true, then... if I did less, slept more, relaxed more, I would get a faster bounce-back recovery from the previous day. So by doing less and not caring so much, I end up with more.
Does that make sense? Any thoughts on those ideas?