Headache over left eye when colon cleansing

I started the Humacleanse Colon Cleanser a few days ago.
Today I woke up with a terrible headache over my left eye.
I've read somewhere that there is a connection between pain over left eye and bad kidney function.
Also a connection between pain over right eye and bad liver function.
Or maybe it was the opposite. Can somebody please clarify?

Could the Colon Cleanser have this effect?