I thought about that, too, Barb, but I have so many unanswered questions still. My family has a history of brain related disorders. My mother passed away from Alzheimer's. My sister had early-onset Alzheimer's and passed away from that, too. Two of my Mom's sisters had Alzheimer's and one had brain cancer.

I'm just hesitant to add another risk factor to my already diagnosed MS!
While I was researching PML I found two articles (both dated 2015) about a PML case with Gilenya and Tecfidera! I had no idea PML was a risk factor with those drugs. I was on Tecfidera until I had that awful allergic reaction. Scary stuff!
I think for the time being I ought to just go it alone...........