1997 Volvo 850 CAR WONT GO WHEN I PRESS PEDAL

Shakes or Wobbles problem
1997 Volvo 850 Automatic 104, 00 miles

I WAS ON MY WAY TO WORK ON A MAJOR HGWY IN TAMPA WHICH IS ALL STOP AND GO AND ALL OF A SUDDEN WHEN I PRESSED THE PEDAL, MY CAR WOULDNT GO UNLESS I PRESSED IT ALL THE WAY TO THE FLOOR HARD THEN IT WOULD TAKE OFF AND ALMOST STALL AGAIN. GOT INTO DOWNTOWN TAMPA AND AT A LIGHT THE ENTIRE CAR STARTED VIOLENTLY SHAKING, ALL LIGHTS ON THE PANEL WENT ON AND THE CAR DIED. I WAS ABLE TO RESTART IT JUST FINE BUT AM SCARRED TO DRIVE IT HOME. ANY IDEA? I JUST BOUGHT THIS CAR A WEEK AGO AND SIGNED AN AS IS PAPER SO STUCK WITH IT. MAYBE A TUNE UP?