My scion TC is shaking when i go above like 40 mph.. it just snowed? HELP PLEASE EMERGENCY!?

I have a 2006 Scion TC.. We just has SNow/ICe/Sleety weather today. i drove to work fine this morning but it has been sitting out in it all day (the freezin rain/sleet/hail. I was just driving and it started shaking when i went above 30 - 40 mph... i stopped and pulled over and it is shaking less but still shaking.. i just had it serviced lke 2 weeks ago.. any ideas? should i not be driiving it.. could it have somehting to do with ice gettin in anywhere? please help! (P.S> i called my gf and had her type it in... i'm still driving)