Thanks for your question on Health Care Magic. I can understand your concern. 4 years old accident can not cause chest pain and breathlessness at present. But better to rule Pulmonary cause because you has chest trauma at the time of accident. So get done chest x ray. If chest x ray is normal then no need to worry for Pulmonary diseases. Uncontrolled stress and anxiety can also cause similar symptoms. 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. 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.