I don't generally have much carbonated drinks because generally speaking I don't like them (a few exceptions to that rule of course) but I haven't had any sodas in at least 2 weeks so I'm not really sure.
or just water with gas, i dont know. sounds strange...
I'm thinking it might be citrus because I did drink like 4 or 5 green teas with citrus yesterday. Just a guess though, I didn't really eat much of anything either so maybe very little food plus too much citrus is a no no for me lol