Should I go to the emergency room? [PLEASE READ, ITS URGENT]?

Sounds like you may have intestinal flu. Avoid Orange Juice, instead settle for milk. It'll help 'settled' your stomach. Eat something light, i.e. porridge. Avoid gy, oily, fried and spicy foods for a week to 10 days. Have some prunes, this will ist with your bowels although I don't think its the cause of your discomfort.