A few questions about glucose levels and beeing sick..

Hey, i am a recently diagnosed type 1 diabetic. I have been doing my shots and things for a year now, about 4 months after diagnoses my honeymoon ended and i started on putting short working insuline in a 15/1 carb ratio. This has been going great, hba1c was 4.8% at first, then 5.4% after the honeymoon ended (currently 6.2%). So thus far i have not had any issues regarding controlling (with exception of the occasional pizza and pasta meals XD).

Since about 2, 3 days i have had a hard time getting my glucose levels to go down agian, i am staying around 10 ( 180 ) and if i do nothing for an hour it goes to 15 ( 250+) or so. i changed my carb ratio to 7/1 and took out new insuline pens yesterday (cause maybe they were expired or something). but no differance, right now i how to shoot up every 2 hours just to supress the glucose level.

I read that this kind of thing can happen when you are sick, and with this entire covid going around i rather not have a high glucose count since that can disrupt your immunesystem should you get sick (or your system gets disrupted when you get sick, so vice versa)

How does these kind of things go for you people out there who have been dealing with this for longer time. What happens to your glucose levels when you are sick? Is it normal to have random days in a row in wich insuline just doesnt seem to work? i have somewhat of a normal patern in diet, and never had problems with it. Do some of you also have this problems randomly eventhough you have a wel balanced diet?

sorry for al the questions, my doctor has been hard to reach during these times..