Ugh, I know the feeling. First year here in college, my allergies flared up because I wasn't used to the environment. That knocked me right to bedridden with a headache so bad I could hardly see straight.
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Oddly, though, due to a self-diagnosed case of emetophobia, my body is physically unable to vomit since age six after a terrible bout of the stomach flu that hospitalized me. I don't remember anything from that time, other than an IV in my arm, and ever since, I cannot even stand to be around someone else vomiting, to the point of sweating like mad and having a rapid heartrate. I don't even feel like sympathetic vomiting; I just have to get the hell out of there, stat.