I’m so sorry to hear of your pain. Have you been tested by a Rheumatologist for autoimmune or underlying conditions? I believe it was an excellent idea for your physician to make this request. If this is the case, any type of efforts to rehabilitate your spine will not take properly and negatively impact your healing process. I’ve had a 3 level cervical fusion & also show areas of the spine with severe disc degenerative disease. I’m 2 years post op and am working with a wonderful Rheumatologist in addressing post surgery muscular & joint pain issues. My Neurosurgeon required this prior to surgery. I’m grateful I was tested pre & post op for autoimmune diseases. The biggest culprit for me is osteoarthritis & DDD. Sending hugs and good thoughts to you.