I think Grog may be onto something. I haven't experienced this on the bike as much as in regular life, but it sounds like the sugar rush/crash cycle. Also, it looks like you're eating plenty of carbs but not a lot of protein. From what I understand, you wouldn't need much protein during the ride for rides of the length you're describing, but you might need more post-ride and in the rest of your daily diet. I consciously upped my protein about 2 months ago, and that, along with less sugar, has leveled out my energy rush/crash cycles as well as my moods.

Good luck!

S