Blood Sugar High. I am 34 years old.

I am 34 years old. Yesterday after I checked by blood sugar at home with in one our of eating lunch and it was 287. Then I rechecked after 5 hours of eating and it was 123. Today morning checked again before eating food and the count was 147. Am I diabetic, am really worried about it. I was covid positive in the month of May, it's been 4 months after recovering. Since then I have cough and shortness of breath, consulted pulmunologist and he said it's due to allergy, which I have since 2019. I am currently having Levocetirizine, Preverab-DSR and using Symbicort Tubuhaler. I am having a sedentary life style since the covid outbreak. Working from home and no physical activity at all. Food intake is also high from past 1 and half years. Weekly twice drinks also became a habit. Am I diabetic now as per the above mentioned sugar test results, if yes is it reversible or will I have to be with this life long. This is really worring me! Could you please advise!