Welcome to our community. Since you asked for any "pointers," I offer my standard action plan recommendation:
First, take a deep breath. You may not have MS at all; it is a differential diagnosis – made by ruling out other possibilities. IF you do have MS, you have found many supportive friends at this site. We come from diverse experiences and hold diverse ideas. We do not agree necessarily in our thoughts on MS; you will probably not agree with some of us either; we only ask for tolerance when we express unconventional ideas.
Second, work with your GP or internist with whom you are most comfortable, who is compassionate and who enjoys being a "disease detective." He can order the tests necessary to rule out some problems. Begin with a thorough baseline examination including blood tests for your cortisol level, glucose AND insulin levels (these are two DIFFERENT tests), thyroid hormone levels (TSH, Free T4, Free T3, Reserve T3, and antithyroid antibodies), even a liver profile, CRP (C-reactive protein) test, (and others that our member jimmylegs will recommend), etc. Ask for a copy of all your test results for your own file (The vitamin D3 test results are good to have there already.).
Third, if you do have MS, start your reading with two books: "Multiple Sclerosis: The History of a Disease" by T. Jock Murray, OC, MD and I think "The Multiple Sclerosis Diet Book" by Roy Swank, MD, PhD and Barbara Dugan is a good second book to read or even have. You may be able to get these through your local library.
Fourth, from this day forward, I encourage you to eat a healthy diet (a good idea whether or not you have MS). Many people find that diet can influence the symptoms of MS. In my opinion, this means a low-carb diet -- removing all sugar (including beer, wine, etc. which have sugar), all artificial sweeteners, including sugar alcohols like sorbitol, xylitol, etc. (These promote insulin production, too.), all trans fats (These also increase insulin.), and white flour, white bread, white potatoes, white rice (in fact, all carbs so far as possible) from your diet. Personally, I think that excess insulin plays a great part in MS. I think that Fatty Liver Disease is also involved. Diet is important. You may find the account of Dr. Terry Wahls and her dramatic improvement interesting (http://www.TerryWahls.com
By the way, the Mayo Clinic is a wonderful place. I went to Rochester, Minnesota, for a second opinion after my local GP had diagnosed Thoracic Outlet Syndrome and had scheduled a surgeon to remove my first rib. At our first meeting my Mayo Clinic doctor told me that he didn't know what it was, but it WASN'T Thoracic Outlet Syndrome! I was optimistic; but mistakes are made even at the Mayo Clinic. They missed on my MS diagnosis, thought the problem was a herniated disc – I unnecessarily had a cervical laminectomy; but MS is often VERY difficult to identify.
All the best to you.