Having difficulty controlling BG when sick, particularly high numbers, is something that gets discussed a lot around here.
There's another, potentially more dangerous side-effect of illness that is often overlooked -- hypos. Hypos that can get dangerous, and hard to recover from.
How? When you're sick with something that affects your digestive tract, food absorption can be compromised. This can make it hard to "fix" a hypo, when your stomach isn't interested in passing anything along to your intestines. Or worse, simply tosses it back out.
I went through this nightmare early Thursday morning. I was fine, healthy, happy, PWD until 1:30am, when I had cramps and got up to use the bathroom
Blowout, if you know what I mean :-)
What followed was 12 hours of lower GI nightmare. And odd, CO2-like belching. Tasting the sandwich I'd had for lunch 12-18 hours before that.
I'd bolused properly for dinner. But the usual rise an fall of BG didn't happen that evening. Rather, it just started heading down. And down. And down.
By the time I was dealing with the back-end problems, I was in the 50's. I'd already been huffing glucose tablets for an hour. I dipped all the way to 42 before things finally started coming back up.
So, I spent the day yesterday (in bed) deliberately keeping my BG over 120. I was scared of insulin all day. Good thing I couldn't eat anyway, due to the illness.
SO! Don't forget that part of the BG control strategy is a functioning digestive system. If it ain't working, be careful about your insulin dosing, and err on the side of high BGs for a few days while you're sick, until you are sure what you eat is going to be digested and absorbed in a expected manner.
I don't have gastroparesis, but I have a glimpse into what it must be like now.