By her "return to normal" comment, I take it Chess's lab has a reference range flagging fasting blood sugar as elevated.
If they remain slightly high according to the reference range after d'cing the medication, it would be an abundance of caution to try to keep from developing diabetes by cutting back a bit on sweets and carbs, but might have positive effects in other ways also, such as contribute toward keeping plaque forming triglycerides down and might help toward not putting on those unwelcome pounds that can come unbidden to so many of us after a certain age with our slowed metabolism.
My two cents worth is these levels are within normal limits and you should not be concerned. If you want to check your diabetic status take an hba1c blood test.
If medications are causing false elevations of blood sugar levels are discontinued, I would think the levels would go down. About the only way to know if they are doing that to your labs is to discontinue them- so check with your doctor about that.
Yeah, you should be a little concerned, though those are barely elevated levels. You might want to cut back on sugar and carb intake some. And watch your kidney function too since your sugar is consistently a bit high to see how your kidneys are doing.