since you have a few months to wait - I'd ask around and try to find an advanced /expert PT that will really be able to evaluate your sx and make a plan for you & that will be open to making changes as needed depending on how you respond to PT.

Oh , do you have any idea of what might have triggered your TOS?

car accident/ fall/ other injury or sport injury?
Desk work/ repetitive or static forward arms & head postures?