I agree with Bassbunny as I'm suffering the same in my left hand at the mo. My left ring and pinky fingers and right hand side of my left palm are constantly tingling and go dead. Originally, my Chiro traced this problem to my neck and left shoulder. The Ulna nerve being the culprit. I'm due to visit Chiro in the next couple of weeks as I live a fair way from him. Last time he freed the nerve, a little less than two days later the tingling was completely gone. Just to check it was the same nerve playing up, I got my wife to lightly press the area it runs to in the upper shoulder area and it hurt like crazy so I know it's the culprit. An exercise my chiro advised and that helped me is to sit upright, push your shoulders down, place one hand over the other in line and it doesn't matter which, with hands facing inwards and whilst pushing your shoulders down as much as poss, gently and slowly raise your hands up from low down as poss and so your arms go up to 90 degress to your body and repeat 3-4 times maybe three times a day.... It helps me but ultimately my nerve needs to be released properly... I messed mine up again a couple of weeks back lying underneath the rusty old vw Golf I own, trying to yank a crankshaft loose with a large breaker bar and I felt the damage when I stood up. Another thing that messes it up is lying on your side on a sofa, with your elbow on the sofa arm and propping your head up with your hand.
Who knows, the exercise might help you too. If it is the ulna you may feel remnants of what I would describe as "pins and needles" in your whole arm as you perform the exercise... Good luck... Rob.