Christmas Eve, I lie in bed with a sore neck (pretty typical actually), lie around in bed until around noon when I need to make food for Christmas dinner with the family. After doing that and getting ready to go with family to a Christmas church service, I decide "hey, this kava's been in the fridge a few days. I should use it up." So I have two 4-5oz cups then hit the road. About an hour or two later, I start feeling very headachey. It was mostly noticeable when I was just sitting there not talking or doing anything. The headache persisted throughout the rest of the day into the evening. When I got home I wanted to see if kava would help with the headache but by then I suspected the old grog in the fridge may have been responsible, so I Alushaker'd up a fresh batch (that was all I had energy for). I could feel the effects and the headache felt diminished but it was still present. Is old kava known to cause things like headaches or other symptoms or did I suffer an unrelated illness?