If this is something you'd truly like to work on, not out of a sense of guilt but because you would enjoy occasionally reciprocating, there are a wealth of resources out there for the enthusiastic amateur (you are far from the only would-be blow-jobber whose spirit is willing but gag reflex is weak). You have more options than "no blow jobs, ever" and "regular whole-hog sessions to completion that result in vomiting."
Mallory OrtbergThere are few things more disconcerting than realizing the first date you thought went so well was in fact a dud.
Mallory OrtbergIf and when you do decide to share your experience with your husband, it should be because you feel ready to do so, not for any other reason.
Mallory Ortberg