I dealt with mobility issues the last 2.5 years after turf toe (healed after 1 year and then reinjured), didn't realize how crucial strengthening was after losing muscle resting, then after research found out how critical loading tendons is to having them repaired. I left my stable job a couple of months ago to dedicate myself to getting my life back. I'd let thumb RSI simmer for a long time too, even though I got to the point where I could do most things with Talon (friction made me get lazy occasionally). The hardest part is mental - the ups and downs, isolation, not knowing what to do to fix yourself, feeling like your body is betraying you and the lack of help from the medical system besides some basic scans and generic advice. I'm glad that I had a cushion so that I haven't had to stress too much taking time off.
To folks dealing with physical pain, I recommend: Built From Broken by Scott Hogan, Rehab Science by Tom Walters.
For joint issues these may help: celadrin, pro-resolving mediators, red mineral algae w/ aquamin, natural eggshell membrane, collagen peptides w/ fortigel.