Please rememeber that Christ raised Lazarus from the dead. So 'Lazarus' was around somewhere, after he died, and then he came back. It's not against the bible to think that something may be left over from a person's life after they pass away, and that some of us are sensitive to those energies.
It also doesn't mean that you are crazy, many people have had similar experiences, and they aren't crazy either.
I've had a few, and they can be compelling. It sounds like maybe you got a friendly warning, running into a big buck can cause a serious accident- I think if anything you might just have a guardian angel.