If you think you will experience symptoms from a minor bump, it is very likely that you will. We train our brains and minds how to respond. Walking down a step will cause a transmission of impact to our head. There are many things we do that cause repeated 'bumps' but we ignore them because we don't consider them as bumps. We choose to define bumps and then respond in anxiety.

Many times, a bump causes a reaction because of the startle factor. We did not expect it and it startled us and our anxiety kicks in.

As you say, you get anxious. This needs to be addressed. Some need meds. Others do well with CBT or other therapy. Desensitization therapy can help.

I've never known anybody who had a delayed reaction to a bump. Delayed reactions can be from over-stimulation. I think many of these delayed reactions are do to poor sleep from the over-stim or other triggers.