I was getting a lot of weird sensations in my left arm for a long time- numbness, coldness, wetness, tingling, etc. Turns out it was due to the super stressed out muscles in my back and neck- a nerve ended up getting trapped. I went to a massage therapist and she released it... that was a weird feeling but afterwards, my arm felt back to normal! I'm guessing your shoulders and upper back muscles are pretty tight, too. If you can't get to a massage therapist, I really, REALLY recommend figuring out a good stretching routine and doing it daily. I can suggest a few sites to get you started if you'd like.