Sorry to hear this. I would say that recovery from a stomach bug leaves you exhausted and washed out even without the DKA. Have you now been given some sick day advice?
My son has had numerous gastro bugs, as is typical with young children, but a nightmare when they have type 1. I have had to deal with them when he was on mixed insulins, MDI, and a pump, and it is definitely easier with a pump. What type of insulin regimen are you on? The key thing is that even if you are vomiting and not eating, you still need some insulin.
When my son has been vomiting, I have tested his BG hourly, and also tested his blood ketones. Do you have a blood ketone meter? If not I would recommend it, as you can then see instantly if your ketones are rising to dangerous levels, whereas with the urine ketone strips, you are only seeing what the ketones were several hours before. If his BGs are high, obviously I can correct with more insulin, but usually with a stomach bug he runs at very low BG levels, with lots of hypos, and ketones begin to creep in. We try to tackle these with by getting him to have small sips of lucozade, teaspoons of full-sugar jelly, sugary ice lollie, anything he can bear to have, accompanied by tiny boluses of insulin. If, despite this, his ketones continue to rise, and/or we can't keep his levels out of the hypo range, we know we'd have to go into hospital.
Do you live alone or is there someone who could help you with overnight testing when you are ill?
One other thing - after this type of illness it takes the gut 2-3 weeks to heal, and during this time you may find your food absorbs more slowly, and you may find it helpful to take your insulin after eating.
Hope you feel better soon 🙂