Liz has a similar thing too. I'd say give it a few more days, and if it gets to a week and you're still not better, then go to the doctor.
-Axel.
Author's response
My friend, my genius friend who knows a lot about viruses and sicknesses, told me it was mild viral gastroenteritis. He said I should go to the doctor.
Thanks, though. Axel has really helped! :D