Common side affects of Rebif:
http://multiple-sclerosis.emedtv.com...e-effects.html

Sounds like it is pretty well tolerated. I hate the shots....been doing them for 11 years and I have just gotten the okay from my doctor to try the new MS pill: BG12

You may want to start searching the internet for disease modifying drugs used in MS so that you have an understanding of how they work and the effectiveness of each.

So sorry about the slumping. I began watching my feet a lot after MS and I always look like I'm humped over a bit. Sometimes my body feels like it is too difficult to stand up straight! When you can....pay attention and watch your posture. Good posture is good for your over-all health and there have been many studies to prove it.
Get yourself some good B12 vitamin supplements and see if that helps perk you up a bit. You can't OD on it so its okay to try!