Whether medications have anything to do with sugar problems or not, I don't know, but think maybe it may cause it to happen more frequent. I'm not on any medications, and I get the same thing, sometimes it'll just come from behind, when least expected! I had a practice one day, and just as soon as I got there...WHAM!...my blood sugar went down and I had nothing to pull it up (the sports drink wasn't enough)! It was tough getting through the class, and as soon as I did, I ran to the nearest vending machine for a quick sugar jolt, then off to the nearest convinience store (called "conbini" in Japan) for a sandwich, and more refreshments.
I realized this happened to me since the age of 8 or so, when my mom went shopping, leaving us in this great big camper with nothing but a container of sugar! I ate the sugar straight, and felt better by the time we got home. I guess I was too young then to realize what was wrong...just told my mom I was really hungry!