Ok I know I've been bugging alot. But my cousin came by the other day and said her allergies were bad so she opened a soda to take a pill and put in my fridge. Well the next day I had bad dry mouth so not thinking about it I took a drink from it. Thinking it was her allergies. Then the next day my ears were plugged and nose messed up. Today it's worse. Now I'm a little achy and nauseated. Can the sinuses cause nausea?