Question about Tb. Time? is it fatal?

Hello doctor :) I had been diagnosed with Tb but in my report it was written as pulmonary kost. I had pleural fluid in my lungs. Doctors have done tapping and drained the fluid from my lungs but the scarring as a result of tapping is causing me some aches here and there what to do. So What is the exact specific name of the disease? Is it Tuberculosis? What type? Is it pulmonary kost? Is it pneumonia? Is it something else? Or all of these terminologies related? What is the root cause of the disease? Can I have cold food? Can I have cold food after the medication has finished? How can I avoid this disease in the future? I was diagnosed with this disease a year before then 6 months I was on medication. I was healthy with just little aches here and there but the other doctor said it is normal to feel these aches. After that a month later i was again diagnosed with the same disease i.e fluid in my lungs. Why did I get this disease the second time? IS IT FATAL? Thank you! HNY!