Metformin

I went to get tested to see if I could participate (un)fortunately I wasn't able to because I didn't have damage on my Optic nerves. Now question, what would happen if I took metformin without being prescribed it? Surely there must be someone out there that is type 2 diabetic on metformin and has MS which makes me wonder if this works then chances are they wouldn't relapse much or at all..? I might be being silly but I would literally do anything for an attempt to remylinate!