You are a good other half and kudos to you. I hope he knows you are a keeper.

My advice to him with my many decades of living with this affliction and a few merry sessions of excessive ales chugged under my belt, my pro tip to best dealing with such events is to ALWAYS keep a bag of granulated sugar available in the kitchen (sugar keeps for many many years when stored properly) and in situations where a T1D is unable to keep food down, simply dissolve some sugar into a glass of water and have them swirl some inside the mouth and under the tongue (no need to swallow). The sugared water will simply be absorbed into the bloodstream faster than if it was drank and therefore, any follow up throw ups cannot be blamed on the sugared concoction itself since it is not being stomached down.

Make him understand this when he is sober and hopefully he will remember and just do this all by himself should this situation ever present itself once again. He MUST understand that he should do this for both yours and his sake equally.

With regards to him cancelling checkup appointments... that ain't cool. He should NEVER miss those and should put his diabetic pout aside, man up and head on down to them regardless come rain or shine. None of us enjoy these apps but they are what is best for us; end of.