Cars and worrying

I was driving to work this morning in 25 degree weather and after having stopped at a traffic light, my car stalled on me when I tried to move again. People behind me were honking their horns. And of course the light is one with a short turn signal. My car started right up again, but I am afraid it is going to happen again and I cannot get the car in to the mechanic until friday! I don't have another car and my sister has different hours than me, so I can't borrow hers. I'm just so afraid that it will stall on me again. I hate worrying. My family is getting annoyed with me. I can't help it.