What Causes Painful Tingling Sensation In The Hands And Feet?

Hi, I am a 21 year old male. I have been having tingling and sometimes shock pains mostly in my hands and sometimes feet. I have had blood work done for vitamin deficiency and it came back normal accept a low vitamin D and high Folate. I have been tested for Lyme, Raynard s disease and Celiac disease (which my father has), all are negative. I had an enlarged parotid gland which they did a procedure on and found nothing. My paternal grandfather had Polyarteritis Nodosa. The pain happens at random times. I have seen my primary and a Neurologist. Any suggestions? Thank you, Joe