There's a carpal tunnel that's full of nerves in your wrist that comes into the bottom part of the palm. When weight or strain continually press there the tissue swells and puts pressure on the nerves in the carpal tunnel. That could be your issue. Also you have a bundle of nerves in your elbow near the "funny bone". When those get irritated the same effects take place. The carpal tunnel affect the first 3 fingers (thumb, index and middle) the elbow effects the left side of the hand (ring, pinky and left side of palm). Nerves are controlled by electricity believe it or not hence the shocking feeling. It could also be a ligament, nerve or vein rolling or moving over other tissue. If it pursuits then see you dr.
When we do right nobody remembers, when we do wrong nobody forgets. H.A.M.C