Glad you are doing good on the interferon - the side effects can be a problem, I was advised here by NHE to use ibuprofen 600mg (if necessary) and it really helps (Tylenol doesn't).
I have had a very specific problem on Avonex - very bad muscle cramps, which my Neuro has just told me are spasms from the ms (worsened around the time of the shot), and he prescribed Baclophen.
I have had ms since around 1999, but it was relatively benign until last year when I had a bad relapse, ended up in hospital, then had another relapse 2 months later, so ended up on Avonex (have been taking it for 6 months now). I have not recovered the functionality I lost during those two relapses, and have worsened a little since, but had no other relapses, so doing good on the whole!
There is a huge amount of information and personal experience available on this website re; treatment, diet, supplementation etc
I posted Dignan's ms drug pipeline above, which gives details of ALL the treatment available or on trial, or being used off label for ms - it is fab, and he is awesome
Hope it gives you some more insight into how much is going on, how aware the folks here are, and some hope for the future! They say there was never a better time to get ms than now...
Don't hesitate to post any questions - the people here are always very happy to help if they can - you can even use it to vent when you get down, or angry - again, someone can relate, and it helps to get it out. This disease is so unpredictable and take comfort that you're doing something proactive by being on interferon!
Be informed, stay cool, and take care...