Hello,
I copied your post to a thread of it's own.

Could the swelling be from some sort of repetitive injury?
Is it only your hands that swell?
Any pain or other symptoms?

We do have a thoracic outlet syndrome & RSI forum if you want to read to see if it might be related to your problem.
I'll give the link for the useful sticky thread here-
http://neurotalk.psychcentral.com/thread84.html