When your blood sugar is too high it can make you very tired or extremely thirsty and have blurry vision and may even lose weight fast.
When you have high blood sugar it will also make you feel sick to your stomach, cause you to throw up and even faint.
Drinking water and eating protein based snacks can help to lower your blood sugar levels.
You should get a blood sugar tester to keep a check on your blood sugar and lower it before it becomes too high.