I have a ptb history, I go for six month medication as prescribed my pulmonologist, he said that i have a minimal ptb. After i take medicine for six month i go for 3 time sputum test and all the result is negitive, i feel pain in my back sometime,ist normal? Because my pulmologist said that this pain is not related to my ptb and also he said this is only my imagination, pls. What is the best thing i can do,thanks a lot