ellekay, even though it won't hurt to check it out with a doctor, i wouldn't worry about it too much.
it used to happen to me all the time when i had a really bad panic attack, right in the middle of it, and it only scared me more. in fact, the left side of my body is always affected by panic attacks and anxiety. my left shoulder would go numb, my left hand would tingle and go numb...i would get these shooting pains throughout my left arm (very, very unpleasant feeling)...and believe me, there is nothing physically wrong with me.
now, i don't exactly know what your particular problem is, but just so you know, it is very, very possible for that kind of symptom to be cause by panic and anxiety.