So sorry Lin for your confirmed DX of MS.
I never had Rebif but I did have Avonex which is the same med....with Rebif you take a higher dose and have a shot 3 times per week instead of the once a week with Avonex.
I had the flu side effects....they never went away or got better, so I stopped A and went to copaxone.
I was on A for 7mos and Copax for 10mos.
I am now only on LDN ( low dose naltrexone).
BTW, I was DXed in 1976 and was med free and in remission for almost 20 years before having a second bad attack. Sooooo I would suggest not taking anything for awhile and see how you do. None of the DMDs are a cure and they don't work for all.
I'm glad you are here with us.. Good luck with your choice of Med.