SentenceDoing

Just a little history first:
About 12 years ago, I was having headaches every day, so I went to the doctor who said I had a problem with low blood sugar (though she didn't test my blood), and told me to eat something like yogurt whenever I had a headache. It usually worked.
A few years later when doctors were trying to find the cause of my seizures, I had many blood tests for low blood sugar, but they all came out normal.
Though I know that sometimes I get low blood sugar because I just feel "funny" until I eat something.

Well yesterday, I had a strange headache that hurt, but it was more that I felt dizzy. It got worse throughout the day, and then last night before dinner, I kept feeling as if I was going to fall asleep standing up. It was the weirdest feeling- like a wave would come over me and I felt like I was falling. I almost thought I couldn't go to class last night. But I ate dinner, and as soon as I drank some lemonade, I felt 100% better. It was so weird. I was wondering if maybe my bloodsugar had dropped really low. I just really felt like I was going to pass out (though I've never actually passed out... but I felt like I was going to fall asleep on my feet), and then I felt better as soon as I ate and drank some lemonade... was this low blood sugar?

Thanks!