Sounds like a really nasty tummy bug but I would get checked out tomorrow if you aren't better. Just to be on the safe side.

I know you probably don't feel like it but have you been drinking much water? Even a sports drink might be a good idea just to restore some of your electrolites.

Also, if you have the runs still and it is like water, it might be a good idea to get something like Imodium or to talk to your doctor about it tomorrow. Apparently if it is really severe it can cause a syphon effect in your bowel and you can get really dehydrated really quickly. If you get a splitting headache in the next day or two (or if you already have one), it can be a sign that your body needs fluids. If you can't keep fluids down or in your system, you might need to see a doctor too.

I really hope you are feeling better soon