AlanB

Hello, I stumbled across the post & dialogue by accident. Whilst the house construction is not really familiar to me, your symptoms sound like those a colleague suffered in a new-build extension. She was one of 30 working there but no one else succumbed. After several weeks, we discovered mould (British!) Growing in particle board flooring under carpet tiles as a resulr of moisture in an unventilated service duct in the concrete floor at ground level. Suggest you remedy radon gas via ventilation very soon as this can cause serious health issues! I'm a Chartered Surveyor not a medic but often make connections when strange circumstances arise in homes! Good luck!