I am 20 years old. When I get my periods in early morning, I feel extremely dizzy and eventually I can no longer stand on my feet. I get a temporary blindness of about 30 secs and a king of ringing in my ears. This has happened to me twice and I have very regular menses. I need to eat or drink something sweet for the dizziness to go away and so that I can stand on my feet once again or else I feel like fainting.The rest of the day goes quite normal as if I have never felt faint in the morning. I want to know if I suffering from hypoglycemia?

I would like the causes of this and what can be done to avoid this as I am terribly worried.