Welcome to our exclusive club...Not..
So sorry about your DX, but I'm glad you found us.
About the DMDs. First, I'd ask your Doc, why he/she chose Rebif over the others. You should be given all the info on all of them with the choice being yours.
Some praize Rebif and others hate it....the same for all of them. You may get lucky and make the right choice, for you, the first time, or you may have to switch to another.
I wish you well..