I used to suffer from my left hand and arm tingling,but that soon stopped after i removed my finger from the electric socket.
(kidding) But seriously though i did have what you have described and it only seemed to happen when i used my computer on a certain table with my wrist bent at a funny angle,and since ive stopped using that table it has not returned,so check your not doing the same thing,or anything else that could constrict the bloodflow or twist or aggravate your nerves,ie..chopping veg,exercise,carrying shopping etc.. Log whenever you get this in a notebook and it should be able to help you find out whats causing it,and even if you dont,this log may be helpfull to your doctor to determine whats the cause.Also high intake of b-vitamins have been known to cause tingling in limbs. Good luck!