That’s excellent finding a PT clinic who are experienced with ES! There’s been lots of posts about how posture can exacerbate ES symptoms, if you want to read up more, @vdm did lots of links to YouTube & other resources here:
My Favourite List of Research/Educational Resources - General - Living with Eagle
It’s gotten quite long but there are exercises on there for posture!
I’m glad that you’re able to spend the time (& finances?!) to get this sorted 
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