Chaos--
I initially came to this forum due to tremors that didn't really respond to meds, yet aren't Parkinson's in nature. I have an intention tremor in my left hand which can progress into a resting tremor when I am tired beyond belief. (I have other symptoms which led me to the MS thread in particular, but I feel like that's besides the point here).
I am obviously no expert in MS, I actually haven't been diagnosed with it (which is good? I guess? But they still don't know what's wrong with me? Annoying!). Tremors, however, I know a bit about. I've got 2 clean MRIs of my brain and Cspine.
Look into seeing if you're able to control it with medication. I have been on beta-blockers (which worked for a while), primidone (which worked for a shorter while) and now Topamax (which I've been on for two months so I guess it's too soon to give a full opinion).
It might not have anything to do with MS. It could just be something along the lines of an Essential Tremor, a tremor that is super annoying but not disease related.
Keep us posed-I'm always interested in those who shake.