Hi Roe,   Numbness is very common in MS, but it is not unique to MS.  What did the Mayo doctors say was the cause of your symptoms or what was their final diagnosis?  I would tend to think that you received top-of-line medical attention while being at the Mayo Clinic.    I'm not a doctor so can't tell you whether this might be or might not be MS.  But here is a post which summarizes what it takes to be diagnosed with MS. Read "Beginner's Guide to MS: Do I have MS? What does it take to get diagnosed with MS?"   I'm sorry that I don't have a better answer for you.  If/when you develop a new major neurological deficiency, then perhaps the testing would provide more evidence for a diagnosis.     Hang in there.  Many of us have been held in the phase of the unknowns for a long time.  You're not along in your experience.