From what I understand of the chemical sensitivity, it is because you are so full of toxins that your liver can't keep up with the detox process and any exposure is then noticed by you. Cuttler says it can be caused if your detox phase I is slower than you phase II.

Sounds to me like it is the chemicals that are getting to you. Your body requires water to survive, but not all those chemicals that are put in it. I don't know where you live, but my water has tons of chemicals added such as chlorine and flouride. I have a shower filter and use products by Avalon that don't have all those harmful chemicals.