Could be a few things. It might be a coincidence and you were gonna get sick anyway, you may have accidentally got some water in your kava bag recently and it started growing bacteria or something ...or you might just be having a bad reaction to drinking too much kava. However in my experience, any time I've ever had too much kava and threw up...by the next morning i feel fine (unlike alcohol). I can remember one experience a few years ago where I drank kava one night after not having any for a year or two...and the next day I felt like i had the stomach flu. I was never sure if the kava was to blame, but it hasn't happened again. A couple years later and I finished the same bag I used that night, without any problems.