The body chemistry caused by a startle like that can set anxiety roaring back.
If you know this is a problem, you can try to learn calming skills. Breathing is the first skill to learn. Finding something to focus on can help.

Find low stress/low excitement things to stay busy with.

I have rescue meds for these time. Propranolol if by pulse and blood pressure get high. The propranolol usually works. I needed a Klonopin/clonazapan a few times before I learned to settle my mind and body.

I have not needed either in years but until I learned to settle my mind, things could get miserable.