I had severe pain in the base of my right hand one day -- carpal tunnel, repetitive stress, bruise... When I woke up the next morning, it was worse so I decided to treat it like carpal tunnel. I switched my mouse to my left hand (I'm a lefty so that hadn't been hard in the past.) Within 2 days, the occasional numbness in my left hand became severe so I switched the mouse back.
While searching for an ergonomic keyboard, I came across a comment from someone who said he had cubital tunnel syndrome. I'd never heard of that so I looked it up. There was a complete list of all my symptoms, including having my hand go numb if I held a phone for more than 10 minutes (solution — a headset on my main phone.)
Braces on both hands helped. I mainly use them at the gym now.
I got some beanbag wrist rests but my hands don't like them. I keep one on my desk to rest my elbow on which does help.
I often wake with my left hand tucked and rolled into my body (and completely numb.) A cheap little
wrist wrap ($9 a pair) with a thumb hook ($9 a pair) has solved that. I put it on a little loosely at night and there's just enough material in the way that it's uncomfortable to tuck my wrist.)
I have yet to find an elbow brace that will fit around my fat elbow.
Recently had my annual physical. My doctor said cubital tunnel is mostly the two outer fingers, carpal tunnel is primarily the forefinger and middle finger.
ETA: I had to return an Imak SmartGlove. It's basically a padded splint to keep the wrist straight at night. It would have been fantastic if it weren't tight enough on me to act as a tourniquet.