Well, first, eating sugar may lead to burning eyes in some degree. And generally speaking, that can be the reason which causes it. At this moment, you need to try some ways to treat it. For example, you can have some cold compresses, and put some cool ice or cool cucumbers on your eyes. In that way, it can relieve your symptom and make you feel well. Also, you should eat a diet rich in fresh fruits and vegetables which provide lots of antioxidants, especially vitamins A and C. in my opinion, it will just be beneficial for your situation. So just have a try. Also, you need to pay more attention to eye infection, for eye infection can just make your symptom more serious.