Hey, don't worry, yeah it sucks and it's embarrassing, but I've had my period for 6 years now and I always get diarrhea with my period every day and a day before it starts with headaches all the time. It's actually normal to have diarrhea with your period because there's a chemical going on with it. I read about it in cosmo once and I felt relieved because I wasn't the only one. If you take a Motrin with it, it'll help and with the water, just keep drinking as much water as possible. If you don't like drinking plain water, make a big pitcher of Crystal Light any flavor that you prefer and that will actually help you keep drinking water. As they say in the commercials: "Women who drink Crystal Light, drink 20% more water than recommended." So then that way you're getting enough. Try steering clear from pop and caffeinated beverages which may suck if you usually drink a lot of coffee or pop but trust me it helps. I don't know what to help you with the nausea. That's a little something I don't know about personally have you tried eating Saltine Crackers? Annoying and bland I know but it might help. You might have also gotten a stomach virus with it which really bites, I've had that happen to me before. Just take it easy, it'll go away after four days or so. The best thing to do is ride it out and if you're still having problems afterwards I suggest seeing a doctor because there might be something more serious going on. I hope this helped!