Anxiety.

You don't feel like eating.
You feel like vomiting even when there's nothing in your stomach.
Your head hurts.
You don't feel like doing anything.
Your body is shaking.
You feel like you can't breathe.
You can't sleep or rest.
You can't relax.
Your heart beats like super fast and slow at the same time, like it's even possible.
Your head spins and it throbs.
You can't feel your brain because it's not working.

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You're just scared, I guess.