Thanks for your question on Health Care Magic.
I can understand your concern.
These symptoms are common after motor vehicular accident (MVA) and known as
post traumatic stress disorder (PTSD).
The basic etiology behind this is sympathetic over activity.
This causes adrenaline and nor adrenaline release.
These two hormones act on all organs of the body.
They cause
hypertension when they act on blood vessels. They cause
increased heart rate (
tachycardia) when they act on heart.
Skin glands causes goose bumps under their influence.
So he needs to control his stress and fear. For this better to
consult psychiatrist and get done counselling sessions.
He may need anxiolytic drugs too.
Don't worry, he will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.