I don't want to be an advertisement on this board but my company has been selling allergy products to people like you for over 30 years. There are products you can spray onto carpeting and upholstered furniture which will neutralize the proteins in housedust so that you don't react to them. Obviously tearing out the carpet is the best way but if it isn't feasible or too expensive this is just one alternative. There are certain guidelines that folks follow to help with allergies in their homes. Drop me an e-mail if your interested in more info. on who to call.