Hadda Bad Day

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Today was a really sucky day. I've been trying to eat clean for a while now. I don't have much weight to lose, my main goal is toning and building endurance. I don't know what happened to me today. Maybe I had the "carb detox flu" or I'm not getting enough calories or something, but I've been experiencing malaise and a headache and overall just a sucky feeling. Long story short, I ate a mini snickers and some dark chocolate to see if it would help, but it didn't. So I ate a bunch of pasta. Carbs don't seem to be helping.

Has anyone else had this experience?