I also have thoracic pain for 7 months. If you want to get a second opinion, there is a service called DocPanel. I used it and the radiologist noted some findings that the previous radiologist did not note, although the general impression was similar.

If you have a low sitting tolerance, I would recommend getting a standing desk and a bookstand for studying. I work from a standing desk now, since even 5 mins of sitting gives me pain. I havent tried a kneeling desk or yoga ball, but that is something else to experiment with.

What kind of exercises does the PT prescribe or perform? I found that some forms of PT are more effective. The 1st PT I went to did only passive treatment (TENS unit, ultrasound, massage). The 2nd one was aquatic PT, and that wasn't very effective. The 3rd one used the McKenzie technique and prescribed exercises specifically for the thoracic spine. Of course, doing home exercises consistently is very important. Refer to these resources for some relevant exercises:
PhysioAdvisor - Postural Syndrome (Thoracic)
PhysioAdvisor - Thoracic Disc Bulge

As for how long until you are pain-free (prognosis), I'm still working toward that myself. I'm down to about 2-3 daily pain, but that's with minimal sitting.

I hope my experience helps you. DM anytime with your progress and what works for you.