What you are feeling is totally normal, it is a typical reaction to a highly stressful occurance.
What matters now is how it is dealt with.
NOTE I did NOT say "how you deal with it".
Speak to your boss, your union, AND YOUR GP. Stress, and your reaction to it is a serious matter. You might need a short period off work, counselling may help .. I don't know because I don't know you, and I don't know your circumstances... but you do need the support of a trained professional .... not a bunch of well wishing amateurs.
What I do know is, worrying about it and trying to sort it on your own, or taking the macho "learn to live with it" line are both TOTALLY WRONG.
In my time in the military I saw far too many "macho" types end up in deep s**t, with all sorts of problems, because they refused to seek help. The earlier the problem is faced .. the easier the recovery... and your boss, as your "supervisor" has a major role to play.