Is there something serious about my sickness?

I have a dry cough that goes away every once in a while but sometimes when I try to inhale and exhale deeply I feel like coughing and usually do. And this morning I had a small pain in the middle left part of my back which hurt when I took a deep breath this bothered me the whole day I routinely take my temperature and it was 100.6 people say I have bronchitis,pneumonia,tuberculosis, and some even said lung cancer please help

Thank you to all who answer