From your description of it, I may have the same affliction- in both arms/elbows. It sucks.
Need to check this out.
Cubital tunnel syndrome, Ulnar nerve inflamation/restriction. Had it for long time but mostly ignored it. Notice it when, for example, doing curls at the gym. Of course that never stopped me doing bigger weights or more curls etc. and my left was always a bit stronger than the right. But this is a new level. I can barely do an air curl.
It is very much like someone with a little hammer constantly tapping away on on your funny bone, causing zaps to run down over your hand, more focused on the little fingers, where you'll have "pins and needles". Similar to carpal tunnel syndrome, except less common, different place, different nerve, and seems to hurt a lot more (I've had carpal too). I kinda
had to help move a couple of beds just now, one quite heavy, so is all flaring up again.
Improvement requires rest and avoiding injury, including "repetitive" injury. Avoid wife who will insist you carry heavy cumbersome stuff. Massage helps. Sleep with your arms mostly straight and avoid sleeping on your hands. There is a surgical option, but no need to rush into that.
Nice looking board there buddy!
Dad joke for the day: I don't know why they call it a surf board - because I never get bored of surfing.