I hope someone can help,

I have a Mazda 6 2.2tdi.

I was out driving and my accelerator got stuck on even tho I wasnt pressing the pedal. The car kept accelerating and even tho I was breaking and the car was out of gear the rev's kept getting higher and a lot of white smoke came out the exhaust pipe to stop it I just had to turn the engine off.

The car then wouldn't start now it does it rattles a lot and when rev'ed the white smoke keeps coming out :-/

Any ideas