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You learned something about diet today. That is how I learned to eat right. If you eat bad and train/race hard you feel it. But on the positive side of things, you can go through a quarter in 62 thinking you have 3 more left. Which means that 4:08 is not that far from reality, it is a matter of building endurance. And, incidentally, you repeated my 800 PR in your split. Yes, that's all I've got in 800 meters, and that is fast enough to run a 2:23 marathon. Which is why I tell every high schooler that can easily break my 800 PR and would be a good 40-50 minutes or more behind my marathon PR that they need to work on their endurance rather than speed.