Stress :(

So I took a reach ahead course this summer. 3 weeks and 110 hours of instruction for one course. Long, boring, and a lot of work. And we had a heat wave. My headaches were getting horrible, so I'd eat to get rid of them. I should have just drank a lot more water, cuz I'm almost back up to 108. fml. I definitely feel much fatter.
Good thing is, I wrote my exam today so I'm getting back on track. This makes me worry though, that I showed this weakness in a time of stress. I can't believe I broke like that. What if I break again in the middle of the school year? It's probably going to be much more stressful with work, volunteering, 3-4 subjects, etc. How am I going to stay strong?
I've been thinking of getting into the "ED Literature", maybe I'll find some triggers. I read Wintergirls a while ago and it was pretty good, but really basic. Plus, all the wanarexics at my school read it. How do I know this? My school had a reading event thingy, and you'd have to submit the name of the books you read throughout the year and some company would donate money to the food bank according to how much we read, and they posted some of the titles of the books... Wintergirls was posted 10 times, which means at least 30 people would have had to submit it. I guess everyone wants a piece of this... here, you can take it.