So, how do you feel when you crash? I had a bad experience this weekend, and it doesn't happen to me very often. I'm on Kuvan, and right now we're trying to determine my new tolerance level. I'm drinking soy milk to add extra protein to my diet, but I drank it too fast and crashed. Hard. I felt foggy. Had a hard time communicating. Had no energy. Pretty much laid on the couch all day yesterday. So my question is, "What happens to you when you crash?"