I’m sorry that you’re experiencing this after surgery, it must be very daunting and disappointing… It does take a while for things to settle down and adjust after surgery; other members have found that muscles can still be in a position of guarding if the body’s been inflamed because of ES for a while, and sometimes PT is needed to retrain muscles, this discussion by @Benwt might be helpful:
One month post op - Symptoms and Treatments - Living with Eagle
@Chrickychricky has posted some helpful links about neuroplasticity, it sounds like this could be very useful for you:
The Science Behind the Symptoms is a great podcast. Attaching a link to an episode on POTS - General - Living with Eagle
Symptomatic.me | Understand & Heal Neuroplastic Pain
@TheDude also posted about having to retain muscles & how ES & protective posture can have repercussions through the whole body but I can’t find that discussion…
I hope that you’re able to find something to help 
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