Why Did My Fasting Blood Sugar Increase After Recovering From COVID-19 Despite Long-term Diabetes Control?

I m a diabetic patient for the last 15 yrs m taking Gulvas met 50/1000 twice a day and fasting is restricted to 125-130 but recently I tested covid positive and have been administered the antibiotics and all symptoms are gone During this infaction period the sugar level was well within control but yesterday it suddenly jumped to 190 (fasting) Pl advise