When I first became a diabetic back in the stone age, we had to check our urine using a tablet that boiled in urine and water. If it was over a certain level, we had to check for ketones. As it was explained to me, when your sugar is very high, it turns into a kind of acid (diabetic ketoacidosis - [DKA]), which can in turn attack your soft tissue (kidneys, etc). Sustained DKA can lead to coma and death.
If you usually eat well and maintain lower blood sugar, a high bump once in a while may not be so bad. If you start seeing that warning a lot, something's wrong and it'd be time to talk to your healthcare provider.
I read you're going through a stressful period and it's affecting your eating habits. Please be aware that stress also affects your blood glucose levels. It's not fair, I know, but I want to give you as much info as will help you.
I wish you all the best.