Mar, I had almost the same symptoms as you about 10 months ago except mine went down my arm also. I never go to the Dr. but after a couple weeks of intense pain I went (my wife being a R.N. helped push me). It ended up being a muscle spasming and causing the pinched nerve (nerves). A shot and some pills and after a couple weeks it went away.                 

Dinner was BBQ country style ribs, sausages, burgers, baked potatoes and Cajun green beans with new potatoes.