Like someone said earlier, I wonder if you're having an allergic reaction to something in one of your products? Even "natural" and "organic" products can be loaded with ingredients that folks can be sensitive to - like essential oils. Since you had this problem when you were using 'poo, is there any way you can check the ingredients of the H&S 'poo and the stuff you co-wash with now? Maybe there's a common ingredient to blame. Would you be able to have a dermatologist or pharmacist suggest anything?