Does PT do any body/posture checks?
* is head /shoulders forward , hunched or rounded - that posture can compress the vascular & nerves that go thru the neck/chest junction..

ask about top rib mobilizations - it may help (mine had got stuck in a raised position and a PT professor/teacher was the one to check mine and got them dropped back into place, it was such a relief)
Then my chiropractor followed up with rib checking/adjustments after I shared that information.
A good chiropractor or bodyworker might be valuable, they might address issues differently than some PT are able to do..

Are you hypermobile? The Beighton Score for Hypermobility - EDS Wellness, Inc.

Along with the sticky threads , you can do site search for specific symptoms or concerns.. https://www.neurotalk.org/search.php
You may look for information on double or triple crush syndrome.. that is TOS plus carpal tunnel and/or cubital tunnel..
Some people do get internal scar tissue and more so after surgeries or injuries.

What is your avg pain level or discomfort level? 0- none to 10 = passing out from extreme pain