Sounds like you both need a therapy, as it is by no measure „normal“ to pull a gun in such a situation. Although I usually advice people on the internet to communicate with their spouses/friends/etc., in a case like this I‘d suggest to put one’s safety first, as your husband seems to be deeply unstable or in some other way mentally very ill.

Sit down and really think about it, as logically as it is possible to you: "Can I safely talk about it with him?" If you have the slightest doubt, get out as fast as possible! If you're 100% sure that he'll be able to stay calm, then talk with him about it. Your husband needs therapy cause with reactions like the one you described he is a danger to you, himself and others. If he gets help and you too you both might still have a chance together, but if he doesn't get help it's just a question of time until he traumatizes you again or worse until he does really something baf and not just scary as shit :-/