Jules--As I have said to others, you are at the beginning of a long, tough journey. It is completely normal to be scared. I think it is important to determine your starting position with a thorough physical examination. Tell your doctor about ALL your symptoms, We hope you have found a caring medical professional to be a partner in this journey.
As to treatment, I am not a believer in any of the CRABs, based on my own experience with C (Copaxone), no experience with R (Rebif), a long 7 years with A (Avonex), and 4 years of B (Betaseron). In my opinion, these drugs were of no benefit to me. My doctor says, "But we don't know how bad you would be right now if you hadn't taken them."
In brief, here is the action plan I suggest to you:
First, take a deep breath.
Second, start your personal MS library 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 the good second book to have.
Third, have a thorough physical exam and ask for any kind of blood test possible (including a fasting serum insulin test--I am known at this website to be obsessed with insulin!). If you have an MRI, ask that the radiologist make a special note of the sinuses. Many with MS report sinus problems (including myself). Ask for a copy of all your test results for your own file.
Fourth, from this day forward, eat a healthy diet. In my opinion, this means removing all sugar (including beer, wine, etc. which have sugar), all artificial sweeteners (These promote insulin production, too.), all trans fats (These also increase insulin.), and white flour (in fact, all carbs so far as possible) from your diet. Taking an active role in some respect with this disease makes me feel that I have not lost ALL power.
The best to you in your journey; don't forget to share your discoveries along the way with your friends here!