Freebie have you actually been neurologically diagnosed with MS. The
ABC-T drugs, one of which is Avonex, are the treatments of choice for MS but the
narcotics you have been prescribed seem a bit unusual. Spinal fluid tests,
visual acuity tests, MRI's while not always positive can indicate the disease.
Methyl prednisone is also a standard treatment but you did not mention anything
but pain meds and Avonex. Without more information it is difficult to know
whether you have repetive/remissive or chronic progressive MS but if you have
had an undiagnosed problem for 20 years it can't be chronic progressive. I don't
know where you live but I suggest seeking out a neurologist who specializes in
MS and get a more definitive diagnosis through more MS specific testing. MRI's
highlight brain and spinal lesions although not all MS sufferers have abnormal
numbers of lesions most do. Fibromyalgia can mimic MS symptoms to a fair degree.
I strongly recommend that you do further research with an MS specific
Neurologist. Chronic pain is not a common symptom of MS in my experience. I have
had R/R MS for 20+ years and have fortunately J had the "standard" exacerbations
and resulting reduction in nerve transmission associated with the loss of
myelin.

Best wishes and good luck
Bob