I had a spinal fusion surgery now have difficulty swallowing food?

I had a spinal fusion surgery done last year, now have difficulty swallowing food. A swelling occurred in supraclavical area. Had MRI, US done. All good. Surgeon says not due to surgery. tested for cushings and it isn’t cushings either. Swelling is on both sides. I am told it is life threatening. But no one has any answers. What can be done? Please help.

Age: 45
Male
Medications: