Big week for you there! I was diagnosed before DMDs were available on the NHS so there was nothing for the first few years and I had relapse after relapse.
Then all the campaigning finally paid off and we could get Interferon/Copaxone. I was back at the GP to be referred to the neuro so fast.......! I chose Betaferon and couldn't wait to get started on it. The only emotion was excitement, to slow down those flippin relapses. I'm still on it now and it's reduced my relapses to less than one minor one a year and I hardly need any time off work for that.
The thing is, to chuck everything we can at MS because it's a big one so we can't afford to mess about with it. There are other alternatives around now such as Tysabri, and more coming online, but for now you're doing the very best you can to combat your MS. Along with exercise, a healthy diet, plenty of rest (my favourite bit, that) and keeping worry/stress to a minimum.
Best of luck when you get started, let us now how you get on and if you have any questions do come and ask. You'll be fine, and if you get any fluey side effects don't try and be brave, take paracetamol or similar while it lasts.