Hello. Thanks for posting at HCM. I have gone through your history. Tb infections of the lung even after complete treatment leave scar marks (fibrosis) on the lungs. It is like a wound on the skin which heals with medications but wound scar persist. So wit every TB infection ,part of the lung gets scarred or fibrosed. This scarring causes a decrease in the ling capacities. This doesn t cause immediate problems but with age the problems may become apparent. It may cause breathlessness, cough and fast heart rate. Fast heart rate is not a direct result but occurs due to breathlessness and cough. I recommend you do a pulmonary function test which requires you to blow forcefully onto a machine which calculates your lung volumes. Another cause of tachycardia and chest pain can be angina or heart issues. Please do a ECG, 2/d echo and treadmill test to evaluate for a heart problems. Please revert back with the above tests. Wishing you good health. Regards