Thanks for your question on Healthcare Magic. I can understand your concern. First of all no need to worry for major heart and lung diseases because your all reports are normal. Possibility of stress and anxiety related symptoms is more likely. So better to consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution. You may need anxiolytic drugs (propranolol and flunarizine combination) too. Don t worry, you will be alright with all these. 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.