Awwww Jappy, I'm so sorry the Rebif is doing a number on you -- the wrong number. Those side effects sound like the ones I experienced while trying to take Betaseron. Avonex gave me fibromyalgia (my neuro mentioned another MS patient of his had the same thing happen) and by that time it was too late for Copaxone, soooooo.......it's LDN for me with none of that stuff!!! Have you ever tried or considered it??
All the best whichever direction you choose...