My group LTD policy goes through payroll deduction, but my income does not fluctuate. How should I proceed?

I have a group LTD policy through Lincoln Financial. It goes through payroll deduction. Basic plan docs are same occupation, 60% of salary. I am an Accountant and have been with my current employer for 14 years. I currently have 5 cervical fusions c1-c2 and c3-c7. Had c6-c7 fusion in May of 2014 and have permanent nerve damage according to neurologist at c6 and c7 nerve root. The pain is getting worse and I was told by the orthopedic surgeon that did c3-c6 and neurosurgeon that did c6-c7 that I have a 100% chance that c7-t1 will fail from pressure. I have not yet discussed with my surgeon his willingness to support a disability claim but I don’t think I can do this any longer. Surgeon referred me to pain clinic for steroid shots, stellate Ganglion shots, meds, etc. I am currently trying to work but I end up going to my car approx. 3 hours a day to lay the seat down and get the pressure off my neck. I am salaried so my income does not fluctuate. I worry I will be let go and lose the group coverage and my ability to file the claim if I don’t act. How would you recommend I proceed with Lincoln?