It might just be that norovirus thing where you are ill for only a day.

I don't know much about diabetes but maybe if you have some sweets (candy) during the day, or eat things like plain digestive biscuits, or like somebody suggested, sip at lemonade, that might help. Hope you're better soon. And if you have some, take some of those anti-diarroeh tablets (lopermide hydrochloride) or ask somebody to buy some for you, the generic brand is fine, no need to pay more for brand names like immodium, they have the same ingredients.

Hope you're well soon