I worked with a girl who was always in hospital with her diabetes during a night out due to lack of prep of what the night might bring. I always start with my normal tea and a full pint of milk before commencing at 7pm sharp especting a 2am finish during this time I may down around 15 bottles of strong lager. Many a time I become hypo mid evening to counter this I order a glass of orange with my lager also. I only carry glucose tabs and all money is spent on beer hence the 3 mile walk home and some night I have been low on carbs. I test when I get home and sometime like you if I have got things wrong or ill it maybe a test of 20+ but I inject fast acting as well as my nightime when I get home the walkorrun home usually works of any excess carbs. it is normal to feel ill with these high readings. I make a point of not testing on nights out as years ago I learnt reeadings are distorted and can drop very fast when alcohol is involved. In summary nights out with drink are trickly at the best of times but with care can easily be managed so you fit in with the crowd its all experience get to know your drinks and carb values.
Good Luck Next time you go out