What causes nausea in the mornings?

Today I had two lettuce wraps full of chicken and cheese and afterwards I was about to leave the house to see my friends when I started to feel like throwing up.
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I had diarrhea afterwards so I think it might be because the food I ate this morning was contaminated with bacteria or whatever. I will be more careful what I eat from now on.
What causes nausea in the mornings?
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