My mum has been ill since Sept 06, she has been to the doctors and had many test, but cant find whats wrong with her. she has a rising burning or heat in her stomach which goes up to her throat, she says her tounge feels tight at the back and feels as though shes going to pass out, but stops herself. the number of times per day differs and the length of time they last can be from a few seconds to a few minutes. Please help