Wierd problem

Hello. I have the wierdest running problem. Sometimes i finish a 5 kilometer run in 30 minutes, smooth run with no problems. But most of the times i experience pain in my diaphragm, like the pain that people who are not in shape experience when they try to run. Problem is - i am running reguraly, 3 times a week, yet these aches come and go(sometimes im forced to run, stop after1.2 kilos, rest, run, stop after 1kilo, and so on) and sometimes the run is smooth, and sometimes not. Doctors dunno what it is im having.


How it is that my body one day "decides" im going to have a smooth excersize, and for the next week im having a hell of a run?
 
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