Thanks for your question on Healthcare Magic. I can understand your concern. Doctors have done almost all tests for the diagnosis of your breathlessness. But they are failed to diagnose so they have written unclear scenario . It is observed that many patients do have underlying allergy which is not picked up by any tests. And this allergy can cause shortness of breath. This is the reason why doctors gave you allergy pill. If you still don t improve then possibility of stress and anxiety related symptoms is more. So better to consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on it s solution. You may need anxiolytic drugs too. Don t worry, you will be alright. Avoid stress and tension, be relax and calm. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.