Christie, welcome to This IsMS. As you will learn, many of us here have our own unique perspectives on this disease; mine revolves around insulin. I suspect that insulin resistance causes excess insulin in the bloodstream, causing many of the symptoms known as MS.
I suggest that you discuss insulin resistance with your physician, and request that he perform a "fasting blood insulin test." – This is a completely different test from a glucose test. Ideally, the result should be below 3 UU/ML; several of my friends with MS and I myself have test results above 9.
Type II diabetics have excess insulin (hyperinsulinemia); since you have said you are prediabetic, I suspect your insulin level is high already. There is no medication to lower a high insulin level; it can only be lowered by diet.
Again, welcome and all the best to you.