I am a 63 female, 120 lbs, 5'3". Yesterday, it happened once and today twice. I had an intense electric-like pain on my left thigh a few inches above my knee. It is sharp and shocking but lasts about three or so seconds. Weird. What could this be? I have been taking vitamin B12 supplements suggested by my endocrinologist about 10 years ago. I had been a vegetarian for 18 years prior and appeared to be having the beginnings of adrenal failure, according to the doctor. So, is this new electrical pain possibly related to the B12 deficiency?