I can definitely see
how you are at a loss right now. The Copaxone sounds miserable, but you can't take the interferons. If it can stall future disability I'd say try to keep on it and maybe use your arms, hips, & stomach more often (with neuro or shared solutions permission). Does the interferons also give you flu-like symptoms, or what type of allergic reaction do you get when you use them?
How about Gilenya, Novantrone, or Tysabri - are those all out of the question?