Sorry about your crash. I had read your quandary about fit and did not comment because I have not had that surgery, although I need it at 4 levels. I am not a real fan of bike fits. I have had three in my life. Two were a waste of a lot of money and one had me in the wrong size frame. One was excellent and made a lot of difference early in my riding career.
One of the things I learned with pain emanating from nerves in that region, balance can be impacted. I am not speculating that is why you fell. I just know when I am in pain, my balance is impaired. Passing that on in case it helps as your neck gets better and better.