Does your arm swell or change color? A lot or a little?

Our useful sticky thread has many articles, anatomy, saved posts, polls, video links - on and on, plus the main TOS drs info sites.

I suggest you skim thru those if you haven't seen them yet.
It's a great crash course of info. # 1 is condensed with lists of links.
http://neurotalk.psychcentral.com/thread84.html

i'm not sure if the lump is actually in your artery or not - it could be a trigger point {small knot} in a scalenes or the SCM muscle.
it could be a swollen lymph node.

if any drs or PT places on our list are near you you might contact one of them for an evaluation -
http://neurotalk.psychcentral.com/thread135.html

I have had good results with an advanced PT and a very good chiropractor.
Tight muscles, sticky fascia and misalignments can really affect the body so much.
But you need to find someone knowledgeable in the whole body and soft tissue injury to check you out and then go on from there.