Can you describe your pain and any odd skin sensations in more detail?
do any of these fit?
burning skin
skin color changes
swelling
extreme sensitivity to touch or breezes

these are just a few of the main RSD symptoms that are usually mentioned.

If not many fit, you may want to read on our Thoracic outlet syndrome forum (TOS) - to see it it fits.
I thought of it because of your comment -
"strained my neck and left shoulder."
here's the link to the useful sticky thread there-
http://neurotalk.psychcentral.com/thread84.html