Re: being ill and having diabeates
It's quite normal (as a diabetic) for your blood sugar to go up when you're ill. Everyone needs more insulin when they're ill, but a non-diabetic automatically makes more insulin to compensate. Diabetes is often diagnosed at the time of or just after another illness, because the body is not able to make the extra insulin that's needed. People who inject insulin learn to adjust the dose to correct the high readings. If on tablets or no medication you should seek medical advice. A short period of high readings during illness is nothing to worry about, but if you can avoid it that's even better.
Often your blood sugar will go up a day or two before you get any other symptoms, while your body is already trying to fight off the virus.