I am very interestest in this topic. My 19 year old daughter gets headaches wheh she drinks water. She loves water and does not drink anything else. She has suffered headaches since that age of 15 and it has only gotten worse. She also has a skin reaction on her hands when they are in water. She takes quick showers and wears gloves when she does anything else around water. Her older sister and I have mast cell disorders and are currently being tested genetically and eventually by bone marrow. I am wondering if this could be mast cell related, especially witht the food issues. My 19 year old will go through all the same testing my other daughter and I have when e have finished. I hope this is a helpful clue for you.