My mum as well as my daughter are both type 1 and I think my mum said she had an aunt who also had it, so there’s definitely a genetic link in my family! My mum was diagnosed in 1967 aged 22 and my daughter in 2012 aged 6. My brother and I do not have it and neither do my brother’s children so far, fingers crossed! I believe that you inherit the tendency towards it but there needs to be some sort of external thing to trigger it. In my mum’s case she thinks it was the shock from when my dad had a motorbike accident which almost killed him (they had only been married a year when she was diagnosed and it was long before I came along!). My daughter had a virus, she became ill on the night of her 6th birthday, it was one of those which makes you really ill for a week and then you take another week to recover properly. We caught it off her and gradually all recovered but I could smell what I now know to be ketones on her breath all the time (at 8am she would smell like she had just troughed a large bag of Haribo sweets when she had eaten nothing since the night before) and she was diagnosed exactly 7 weeks after her birthday.
But I also know people with type 1 who have no family history of it at all, so it can happen to anyone. If you keep drinking that much over the next few days I would strongly suggest you get it checked out, even if it’s not diabetes there might be something going on.