What is wrong with me??

Yesterday I ate 8 slices of pizza before going to work. At work I ate a bag of chex mix and a bowl of soup and a big sandwich. Was still hungry after work. Then every time I had someone who was dirty (I'm a CNA) I would gag. I've never done that before and other coworkers said they couldn't even smell it. Today when I wake up I'm still starving and nauseous! What could cause me to eat so much and not feel full but then feel nauseous? 
*Edit: I normally eat healthy as I have a very active life. I was just craving pizza. And I didn't feel sick until I went to bed after a whole day after eating the pizza.*

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