I've noticed that even a mild consumption of beer following (even a few hours after...) using whey produces a nasty eyeball headache. Of course I've avoided doing this since the discovery, but recently I've experienced the same headache after using some Hershey's syrup in whey/water. I use standard Jarrow unflavored whey, which otherwise fits the bill nicely. Can anyone offer any enlightenment on this? I would very much appreciate it.