Believe, I know what happens to long-distance writers, and suggest:
Hands/wrist/fingers/forearms hurt or tingly? You cannot fix this by yourself. Contact dr. and demand referral to a physical therapist. Yes, it costs money, but trust me, you cannot live without hands. (Try to worm out of the "nerve conduction test," aka the "nerve crucifixion test.") The physical therapist can show you how to prevent future injuries.
Gettin' flabby? Walk for 30 minutes a day. It's like keeping a journal: hateful for the first few days, then addictive. Now that I am older, a walk, like, gives me an actual buzz, man.
Backache? Get a back-support pillow, and/or a "kneeling chair." This latter will force your back muscles to hold you up and thus stay strong. Lots of backache? Give a chiropractor a chance. They do not cost as much as MDs and will not invade your body nor prescribe poisons for it.
Stressed? Go alone someplace strange or do something you've never done. Once I went to a solo drum concert. Another time walking in an unfamiliar field I found a teepee and hid inside. Once I forced myself to have tea at the Adams Mark Hotel. Once I went to a psychic fair & there I got a photograph of my aura (it's red).
Soothe eyestrain with "computer glasses," aka "single-vision lenses." The eye doc will know what you mean.
Depressed? This isn't for everyone, but a really stubborn case that does not respond to therapy may respond to piercing. No joke. I got through a horrible passage of my life by having my ears pierced with an 18-gauge needle at a heavy-metal tattoo and piercing parlor. I was the only customer wearing a Kasper suit and pumps and pantyhose. BTW, this is why kids get piercings; the more and grosser the piercings, the sadder their lives.
If writing is making you suffer, there's something that needs changing!