Ring finger numbness and pins-and-needles in the fleshy part at the bottom of your hand are consistent with a trapped or inflammed ulna nerve
(the one that makes your funny bone uttery hilarious
).
Not sure whether if could make your whole hand numb but it can cause a sort of "ringing" feeling around the lower wrist.
But (and it's a big but
) the problem could be anywhere from just below the shoulder blade at the spine, right through to the wrist.
I suffered from an ulna nerve problem that was due to poor posture. When I was bench pressing, my right elbow would click resulting in overwhelming pain and my whole arm going numb for about 2 minutes
. When the pain subsided, I was left with pins and needles in my hand.
The physio said that because I worked on a computer, I was hunching my shoulder which caused the nerve to "shorten". This made it badly aligned at the elbow so it "snapped" across the tendon.
Horrible.
I cured it by a strech which is very useful to anyone who works on a computer. Every hour, sit straight on an armless chair, dangle your arms by your side, palms facing backards.
Now, keeping hands flat, bend them upwards at the wrist, pushing the "heel" of your hand as far back as you can. Expect your shoulders to crack
but don't worry about it!
Hold for 10 seconds and relax. Do this 3 or 4 times.
It's a great stretch to do whilst shooting - it increases my draw length so I do it when my arrows start to feel a bit too long for my clicker!