Dealing with anxiety after a near-accident while driving

Had an anxiety attack while driving. Driving is already a hard thing for me it took a lot for me to learn how to drive and now I am able to drive without any fear except big trucks driving by. still working on that one. Anyway today I almost got into an accident which was not at all my fault but it jostled me. How do I sit back after the wheel after this without fear. For those who want to know how I almost got into an accident this is what happened. im sitting behind a train track. we sit behind the track because this is a used track it is dangerous to be on it waiting for the light at the intersection in front of the track. The car behind me gets mad I assume that I am not closer to the vehicles in front of me and zooms past while I am starting to drive because the light turns green. the car got fast enough to get in front of me but it was scary I could have hit them they could have hit me all because they didn't like i was being safe and not waiting on the tracks but behind them.