For those that have or may have chronic RSI I really suggest reading thru the Useful Links on our TOS forum -- just in case you may have that also. { the combo does happen}

There's also therapies for RSI listed too {that's how my TOS started = RSI, then shoulder injuries/strains, c spine strain and then all of those combined together}

You might be able to lessen some of the TOS pain with gentle posture or bodywork, triggerpoint work, massage/myofascial release, etc.

Or from a xray or MRI you might find out you have a extra cervical rib causing some of the problems, or that your vascular system is being compressed in the scalene/neck/collarbone/top rib.
With TOS the nerves or the blood flow can be affected by compressions.

the link- http://neurotalk.psychcentral.com/showthread.php?t=84

sorry i had the wrong link there before !