Hi Haley,
Welcome to the NeuroTalk Support Groups!

Here is the link to the
Thoracic Outlet Syndrome Forum
The members there should be able to give you some information and support.
I found some older posts there.

Repetitive Strain Injury Forum

You could also try a whole Forum search using keywords
e.g. shoulder impingement or should impingement syndrome or subacromial impingement

Forum Search

Just post again if you need any help finding your way around the forums.
All the best to you.