this may sound really stupid but drink alot of water!
i've had to deal with cts and tendosynovitis alot because of drawing/engraving all day and then riding bikes afterwards.
for about half a year now i am much better but still not fine.
wear large sweatbands when you go ride and do alot of physical work with your hands. it is really important to keep your joints and especially wrist warm not to abuse the tendonts!
also cts is related to kidney problems because first if your body is dehydrated (wich happens easyly when you go and ride) both your kidney and tendon sheaths are getting easyly damaged plus if you stell well hydrated your body is naturally "lubricated" and the friction in your sheaths and joints is lower. really is or at least seems to be. also for me helps is when i don't have to switch between fine motor work with my hands (like drawing etc.) and rough work and if i do so taking my time, GENTLY stretching alot and as i said drinking rediculous amounts of water.
also i am a bit addicted to rice milk and amazake lately and thought about it may being related with my hands being much better too...
so keep your wrist warm, when you ride and when you go to bed! because you body cools down at night and i used to have terrible cramps waking up at night. maybe use a warming cream, ginger-chili rub or similar from time to time.
drink water
and stretch.
then you shoul get alot better.
ah... and also eat alot of stuff that is generally good against any kind of inflammation, like garlic, ginger, fresh chili, etc.
best of luck and get well soon!