What kind of doctor should I see (if any at all)?

I hadn’t been to the gym in a while, and when I went a few weeks ago, I took it relatively easy. I was stretching, a bit too strenuously, and I pinched a nerve in my neck (think). Either way, I had to leave immediately because it was just too painful to turn my neck, and really move.

About a week later, I have noticed that there is a tightness (in a nerve?) that runs down by biceps and inner arm and into my thumb. It is tight and often, my thumb feels numb.

I’m a bit freaked out – what can I do? Which sort of doctor should I see, do y’all recommend?

Thanks so much!

Distressed,
JonnyCeltics