High sugar level with no symptoms. This?

Hi recently I did a full body checkup in which my fasting glucose level came as 336 and average blood glucose level came as 320, My Hb1Ac is 12.2 in the report, from the values it is clear to me that I am a diabetic but I have no symptoms as such , Is this because of work load ?? I work 18 hours a day with 4 to 5 hour sleep from the past 3 months also my diet is not so unbalanced I eat 6 chapati daily with Vegetables or sometimes daal rice , weekly once non veg and hardly any fast food or sweet in a month or so My both parent is/was diabetic ( lost my father due to respiratory attack) , my mom is with me she takes medicine for her diabetes, please suggest the solution or medicine as I can see I have entered into the age now where these will be a part of life or is it too early or late to take any action for this??