It's not yet the final line in the book. Three months in, with proper rest, improved ergonomics, changes in posture and/or managing stress, appropriate PT, you may well drive the monster back. Fingers crossed.

If you do PT, beware of anyone who wants you to strengthen your way out. For most of us, that makes matters worse. Also, many people have a "no pain, no gain" mindset. That doesn't seem to apply to TOS. If it hurts, best to stop doing it.

That's my 2 cents.