My husband (type 2) gets like this and I am the one who gets his venomous out bursts, his latest two weeks ago when he nearly killed us both when out in car.He is mr wonderful to everyone else
You know, you have hit on something very important here .
There is next to no education or support for the family of diabetics of any type really, and it can come as a huge shock if blood glucose swings seem to bring about a Jeckyl and Hyde type personality change. I remember one man being brought into A&E that took six porters to restrain, who was the nicest, most apologetic person on the planet when his glucose was normalised. His wife was completely traumatised , and the mood swings had been going on for quite a while without her knowing the cause.
BECAUSE you are family, you will get the brunt of it, and the sad thing is he may not know, care ( at the time) or even have a recollection of being this way with you. I can re,e,ber some incidents where I felt as if I was possessed, I used my tongue as a whip, and knew exactly which big red buttons to push on my current victim, and part of me was standing inside thinking " Oh, no no ! This is NOT what I want to say!" While the exterior knew there would be consequences and just didn't care, that I just couldn't stop. Oddly, it was never, ever, at work, or socially. Just with family. I am forgiven, because they knew it was totally out of character, and there was a medical reason why I displayed my shadow self with such venom, and why some that I did and said, I have no memory of.Since I crawled out of diabetic burnout, those episodes are gone, but it makes me even more vigilant that my glucose levels are stable . The remorse and embarrassment still remain
You are in a hard and difficult place, and I feel for you.

When your husband is behaving like this ( and I'm presuming this is only since he became diabetic ) he really needs to check his glucose levels. If he hasn't got a meter, get one. There are some lovely people on here that can post up the links for the code free meter that many Type 2's buy if they cannot get a meter or strips on prescription. Getting him to self test may be an upward struggle at the time, so it's worth having a frank chat about how you feel, and the impact is on you, choosing a time when he seems to be in a good place. It's worth taking in to account that he may also be struggling with his diagnosis too, so talking about him may well help him, and I urge that he asked to be referred for psychological support from his diabetes team.
You too may benefit from seeing your GP and telling them how you are feeling and what you are experiencing . See a councellor if it is offered, or just ask to be referred. Keep posting on here, ask questions, vent, rage, share how you are feeling. Relatives of diabetics need this as much as those who are. You will be supported.
Signy