“Possible pre-diabetes?”

I’m a 41 y/o male. I’ve never been diagnosed with diabetes but I check my blood sugar at home to be proactive. For the most part, I’ve always tested in the 85-92 range. But lately, it has been higher than 100-110. I am currently recovering from both Covid and a sinus infection. I was hospitalized last September with a kidney stone and near-fatal upper GI bleed. I had 3 trips to the ER leading up to the hospitalization and all 3 times my blood glucose was high which they attributed to the pain I was in. A week later during my hospital stay, the numbers ranges from 90-97. Most recently in December, the lab test was 93. It’s been about over the last week it’s been over 100. I don’t drink or smoke, I have an active job and I work out 4-5 days a week. I try to be mindful about what I eat. Can a sickness cause blood sugar to rise? I can’t imagine going from normal to pre-diabetic in less than 6 months. Any advice would be greatly appreciated. No real symptoms- thirst, more urinating, etc. I do have fatigue but as I said I’m recovering from Covid.