Thanks for your question on Healthcare Magic. I can understand your concern. First of all no need to worry for heart diseases as you are young and your ecg and blood reports are normal. No need for dengue an swine flu report as you are not having having fever, cough, cold and joint pain. Sometimes undiagnosed stress and anxiety can also cause left sided chest pain and Tiredness. 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 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.