hi park! i'm 35 fem recently diagnosed and my 2cents are: eat right, now! don't wait for diagnosis, just look at where you can improve your diet and exercise and maybe you can head off further decline while the doctors dither.
i think i've read it elsewhere on this site but will restate that some elements of those diets are not necessarily for you - i would research why they make each claim, take all the general good ideas on, and then begin to figure out where my own sensitivities lie before i'd accept any restriction based on potential allergic reactions that would vary from person to person.
i'm sorta like brown - i do the Omega-3 with the flaxseed oil and 4000IU D3 (plus I now take a bajillion other supplements too) and i know (only from skin surface injection testing- whatever you call that) that i react mildly to oats but not wheat so that gluten bit's easy.
i'm also a bit like dahlia - was vegan but have now added fish and fish oils to be safe.
i think your most important supplements would be D3, and the omega fatty acids, and in my case b12 (methylcobalamin) is a biggie for neuroprotection because i was deficient. (i also take calcium to help absorb the b12 since i don't eat dairy and am not sure about my calcium intake from other sources - although i do eat non-dairy foods that contain calcium.)
since i started my huge supplement program in early feb06, i have noted improvements such as my lhermitte's sign associated with my cerival lesion disappearing, the numb shock reaction to pressing my spine next to my thoracic lesion is gone, the tiptoe part of my neuro exams is easy again, and some sensation has returned to my feet, although the rest of me is still numb (large fibre modalities only - i still can feel temp and pressure) and my hands still drive me crazy (they were the last thing to go, so far). i went from bedridden in early feb, to the point that i taught skiing 4 hours per day last week.
if you're interested i'll send you some info to read - i've been compiling ms-related nutrition abstracts ever since i recovered from my LP headache at the start of feb 06.