My car recently shut off while I was driving

My car recently shut off while I was driving. There were no signs or indications of the car smoking or temperature gauge going into the red. I had the car diagnosed and come to find out the timing belt went out which wrapped around a pulley. I had the car fixed. The mechanic called and to me the head gaskets were blown and needed to be replaced which will cost me another 700.00. I didnt allow him to fix my car because I felt he was after money. I got my car back but when I start the car its a very loud rumbling noise and the entire engine shakes which cause the car to shut off. At this point, there s still no signs of smoking or the car getting hot. I am at a loss and do not know what to as far as getting it fixed. Can you please help me in figuring out what may be wrong at this point? IM FRUSTRATED!