So sorry that your surgery hasn’t been helpful so far…it has been mentioned by others as a post-surgery issue; here’s a link to a really old discussion, the member hasn’t been on for a while now but he was recommended physio, so definitely keep pushing for that:
Post surgery problem - General - Living with Eagle
Another member had cervical instability, but mentions shoulder weakness, so has posted exercises given by the physio; might be worth a look, but be careful!
Two month surgery update - Symptoms and Treatments - Living with Eagle
I hope that you get your referral soon, and that your nerves start to heal 
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