i am 23 years old and i was mdr lung tb patient from 2008-2010 but three weeks back i have bloody sputum but no lung pain or any symtom that is related to tb, i took ethemsylate and it got well now these morning when i wake up i started having pain in the centre of my chest, what could be the reason,, my sputum results are all negative,, please help me, thank you