I too am on Rebif, 3 injections a week. at my intial consultation the MS nurse went through different beta interferons with me and I picked the best one for me. I have only been on the injections 6mths, but have found they have helped me dramatically.
I was given a DVD and information pack from REBIF on how to inject, the side effects I could have (this was also discussed with me through the MS nurse). If you would like information on the REBIF, I can certainly email you things from the book, I was also given a book called my mummy has MS, which helped me tell the kids. I have been really lucky in the sense that everyone in the MS field has helped me and given me choices and gave me in depth info, I go to MS clinic every 3 months to get my blood checked and again they review me, I also have the opportunity to ask any questions about things I am not really sure about.
I know how you feel with just being palmed off as before I was diagnosed it was a vicious circle of Docs telling me I had an ear infection and take this and take that or it was all in my head.
I still have side effects and the day after my injection I do feel like I have went 10 rounds with Mike Tyson, but it is easing off.
Take care and speak soon