Hello all.

After all my workouts I drink one scoop of whey protein from Optimum Nutrition mixed with 8oz of coconut water.
Around 15-60 minutes later I get explosive almost all water diarrhea. (sorry if too graphic)
It also used to happen when I used just water instead of coconut water.

I realize I am probably allergic to the whey protein. Does this mean I am lactose intolerant? Or dairy intolerant? Or just whey intolerant?
Would I be able to stomach egg protein or casein protein?

Any answers or suggestions would be appreciated.