Postional pain and neurologic symptoms (as you describe above) is a key defining characteristic of TOS. Many of your other symptoms also align with TOS.
I would suggest that you see a TOS specialist. A number of doctors are listed in the sticky notes and throughout the posts. If you don't live near one -- then I would also recommend that you travel to get to one. Its best to get a handle on this ASAP.

Also, many folks on the board have suggested seeing a physical therapist that has training/certification from the Institute of Physical Art. Try to find one in your area.

Thanks for sharing your story. It's very encouraging to hear that you have improved so much from the trigger point work.

Best wishes for continued improvement...