i think the 'why' is because SOP for neuros is to get patients on meds because it's 'supposed' to be better. longer term studies have shown that's not actually true.
i have a strong anti-med bias, so i'll balance out the pro-med end and maybe you can find someone in the middle with that second opinion. or come over to the dark side lol.
from the nutrition standpoint, if i were in your shoes i'd be trying to figure out what might have caused those lesions to occur, and comparing my own nutritional status with the list of nutrients known to be off in ms patients. to see if there were any matches. here's one example: an old protocol for ms (klenner, an oldie but a goodie for its time) has a strong emphasis on treating with vitamin E. (vitamin B complex also very prominent). interestingly, interferon-beta has been shown to normalize low vitamin e levels. i wonder how that happens exactly! and why the heck one wouldn't just eat more vit E rich foods... (and/or take a good quality natural source E8 complex supplement)
Nonenzymatic antioxidants of blood in multiple sclerosis (1999) http://www.springerlink.com/content/dflv5gx818uhy8dd/
We investigated the plasma level of lipid peroxides ... (glutathione, α-tocopherol, retinol, plasma sulfhydryl groups, and uric acid) in multiple sclerosis patients with exacerbation or in remission, including a group treated with β-interferon. ... the ratio of plasma α-tocopherol to cholesterol plus triglyceride was decreased (P < 0.001). ... β-Interferon increased plasma α-tocopherol levels (P < 0.001)