This is day 3 for me and I had a headache borderline migraine yesterday all day. For me it seems that my physcial condition is worse now than it has ever been so that may play a part it in it. But my headache broke last night and I still have a mild one today but I really think it's detox. As far as the burning in the back of your throat...I would lay off the cayenne pepper for a few days until you get back to normal.