Hi fruitsalad, My guess would be that you are allergic to something in the drink as the symtoms are very like one
gets with hay fever or some other forms of allergy. I have an allergy to lanolin found in certain soaps and washing powders and it took me years to sus out what it was. If i'm right it will get worse before it gets better if you don't do something about it now. Depends on what you drink but
it is probably one or more of the addatives that go into the drink. Try changing your brew until you find something that doesn't effect you like that.