Hey, that is usually my line, get back on the horse. LOL
Ok, this is a normal reaction to a bad experience. Once we have something bad happen, our brains never forget it. It is a natural process that takes place in our brains. And the brain also tells the body, to fear or have a reaction or compultion to do something whenever there is a reminder.
So, that being said, I would not run away from driving or going over bumps. You have to acknowledge that yes, something bad did happen, but you also have to tell your brain that everytime the eyes view the road or the body feels a bump that the brain is only remembering an incident.
Therapist call this gounding as we allow ourselves to remember by sight or a feeling but we consciously tell ourselves, it is ok, it is not happing now, it is a memory or reminder nothing more.
Everytime you do this, you actually repair the fear or the damage or trauma caused to the brain. You will form a new connection within the brain that can give a reason or give an acknowledgement that it will not happen everytime something is seen, felt, or remembered.
This is what many people do not understand, this is how the grounding method really works. We are giving a solution to our brain. Whenever the brain has experienced and event, that is a question or a start, the brain needs help to find the result or a solution. If all we do is focus on the startle, event, question, experience, then the brain will not rest or begin to resolve unless we allow it to do the full processing. This is what happens when we have nightmares, flashbacks, triggers etc. It is our brains constant question looking for a solution. The path to solution is acknowledgement and accepting it as a passed event, not a present or future event.
Open Eyes