I have had symptoms for a week now:nausea,stomach pains,hot flashes,headaches, and diarrhea.I thoughtcit was just a bug or something but it is not going away. I have tried eating and drinking but I feel like a constant hangover.do I go to er or wait longer?

Um yeah.. go to the doctor or to an urgent care. I wouldn't rely on the Internet for something like this. I had severe headaches for 6 months before I saw a doctor, long story short it turned out I had a brain tumor. I'm sure you're fine just be sure to get a professional opinion. Hope you feel better soon :)