What do i do if i think i have a gi infection?

It depends: Infections most often cause diarrhea, often accompanied by pain or bloating. Diarrhea is often due to viruses and treated by clear fluids or electrolye drinks, then bland food (bananas, rice, etc) until it improves. Vomiting is treated similarly. You should see your doctor asap if there's blood passed, severe pain, high fevers. Or you cannot keep down enough fluids, or if recent travel abroad.