I went fron Avonex, 1x wk, to Betaseron as my Doc wanted to get 'more aggressive'. I feel, looking back, that I was barely functional for the 6 mos. I was on it.
I was switched to Copaxone, and have experienced virtually no side effects. I felt increasingly better since the week after I stopped Beta.
My neuro said that 'clearly the interferons don't agree with me'.
I'd have to agree.
I think you need to have a good sit down with your Doc. If he's unwilling to consider anything else you need to know why, then the tx can be more bearable. Best to you