Having engine problems with my Honda?

hi. I have a 1990 honda civic sedan that has 220,000 miles on it. the oil was changed fifty miles ago, along wigth the oil filter. today i was driving it around and i stopped to get gas. when i got back into the car and started it, it struggled to start and then died. i tried to start it again and it started, but the engine was shaking more than normal. immediately as i accelerated, the car started shaking more, and it was struggling to accelerate. there was also a haze of smoke trailing behind me while i was driving. it was a light grayish color with a very little tint of blue. it wasnt thick. once i got up to 25-30 mph, the car would act decent, but if i went past 45 the shaking started again. and when i would slow down for a stop sign or light, the car would almost stall and in some cases it did. after five minutes of driving it, i pulled over and popped the hood. the engine was HOT. very very hot. but the gauge in my car, which does work, showed a normal temp. and no warning lights of any kind popped up. i got in the car again and drove slowly the rest of the way home (10 miles) while idling you can hear some type of rattling coming from the hood. i dont know how to describe it but the noise is like a marble being tossed around in a gl. im really worried, and i dont know how it could be fine one second and a disaster the next. what could be wrong? thanks.