Here’s some further points, suggesting cervical instability, I think your condition could be being aggravated by putting your head into flexion.
I would try and avoid that by doing whatever tasks you can sitting down (so that your head is looking forwards and not down). Lift your work up to eye level too, i.e. raise laptops, use bookrests, adjust a gas-powered office chair to the appropriate height. If I were you, I’d be wearing a phladelphia collar with liners too.