31 female work as a cashier, but every once in a while for about 2 weeks or more at a time i'll experience this electric shock... feeling in my hand mostly the palm but can go to elbow, it hurts so much to even wash my hands, or rub them together?

If those symptoms are only from the dominant hand (the hand you use to punch the keys), occupational neuropathy due to entrapment nerve could be the cause. If symptoms are alleviated after you are off work for one week, neuropathy is likely & the treatment of choice will be changing your job duty, avoiding repetitive action with your wrist. You should see a neurologist for the definite diagnosis.