You were taken in by a bad reader. I suspect that all of us will be involved in some kind of car accident in the next few years. How general of a prediction is that!?
Please remember that any prediction you get, even from a good reader, is subject to change with every other thing you do in your life. You are the one in charge of your life.
There are bad readers everywhere. I've been to tell and heard horrible things. None of them came true, so don't be thinking this is going to happen. But at the same time, I believe that we call things to us. So if you are constantly thinking that you will have an accident, I think you may draw it to you. So try to relax and laugh it off. It really is a very generic prediction. Like I could tell you that you will stub your toe at some point in the next few years. Yeah, that could be likely to happen to any one of us. Myself especially because I am very clumsy.
Any reader that lets a sitter walk away in fear is a very bad reader. If she could have given you more info, narrowed down the time frame, and then given you some guidance as to how to avoid it or at least lessen the damage, then I would have listened to her. Like, for instance, make sure your tires are ok, or get the brakes fixed, etc. Something like that, something helpful.
So don't worry about it.