As you say, with a high BG, your body is likely to be insulin resistant.
Have you tried taking a higher correction bolus?
If my BG is that high, I need twice as much insulin to correct.
I also find, when I am ill, I may need 30 or 40% extra basal.
I don't think you are a naughty diabetic and whilst ever high increases your risk of complications, long term high usually refers to weeks rather than a few hours or day.
Focus on getting better. Drink plenty of fluids, rest, test, correct.