In costa rica "bug" going through town. stomach got extremely bloated then i threw up multiple times. next day no appetite, headache esp. behind eyes.

Stomach bug.: Start w clear liquid like water, slightly flattened soda that is clear, or sports hydration drinks. Sip, sip, sip. Work up to solids w bland foods like bananas, rice, applesauce, toast, gelatin, or chicken. Avoid alcohol, nicotine, caffeine, dairy & high fat foods. Rest. ** Please clarify what your question is if I am not answering it.

Gastroenteritis.: Sounds like u had the beginning stages of gastroenteritis or "traveler's diarrhea". It starts with vomiting & fever (upper GI tract) b4 going to cramping, bloating, diarrhea, etc. Once it enters the bloodstream, headaches, etc. can develop. If it was bacterial, a stool test cd suggest a good antibiotic to use. If it is viral, not much can be done except staying away from others to prevent spread.