Sir “I have had breathing problems for about 6 years. When I walk fast or travel, my breathing becomes very rapid, I get very tired, and I develop a severe headache all over my head. Sometimes the headache is so severe that I cannot even move my head. The headache does not go away quickly. Inhalers have not helped much. My basic tests are normal, and my HRCT chest is also normal. Which specialist should I see for this problem, and what further tests may be needed .