infectious gastroenteritis

I suffered from vomiting and stomach pain on Sunday afternoon.
The symptom lasted until midnight.
I couldn't stand it , so I went to the nighttime emergency medical center , where I worked the day before.

I got a pain killer injection.
But it didn't do any good.

I suffered until around 2 a.m. , then I got better little by little.
I guess the bacteria were dying because of the antibiotic.