I get this - pain in the left shoulder and "pins and needles" and tingling down to the mid forearm - several times a day. Sometimes the pain aches so much it's hard to deal with.
I'm a PC user at work, and use it for several hours a day (about 6 or 7). I have a feeling that the pain and other symptoms are to do with poor posture at the workstation as I tend to lean on my left elbow.
If others out there who are regular PC users have similar problems it may be because of this. I have altered my posture at the PC and the symptons are less recurrent - but no less severe.
A VDU assessment by your company's assessor may highlight the problem, so why not give it a go?
Sufferer in silence, UK