It's day 3. I woke up at about 3:00 AM and threw up, then went back to sleep. I woke up at 6 and tried to go back to sleep, but ended up lying in bed for 2 hours because I couldn't.
My stomach feels a little better, although the pain seems to have spread down my thighs. I've had a little bit of water in small sips, but I usually throw it up.
Also, I have a pretty bad fever.
I haven't thrown up in a long time now, and it feels like it's getting better, so I think I'm gonna just wait. If it continues, I will probably drink a bunch of water, which will hopefully splash whatever is in my stomach around, and allow me to throw it up easier.
Also, thanks to everyone in this thread.