I Am Always Sick, Mainly Breathing Problem And Cough, Since

I am always sick, mainly breathing problem and cough, since birth. Many times have a pneumonia attack. I changes my city in 2010 for studying. the course was of 4 year. When I reached the new city all my illness vanished. I stoped taking my inhaler and medicine. In that 4 year I never felt ill. But after leaving the city I am again back on inhaler. 2 day ago I fell ill and today I bought my old medicine. I am using Aerocort Rotacap, Theo-Asthaline and Betnelan. So whay this is happening ?