Experiencing BREATHELESSNESS

Haix....
The first word for today is really "HAIX"....
can't breathe... morning till now... feel like fainting...
even going for a game of badminton will be the same...
what the hell am i going through....
haix...
Even specialist also say i'm super fit... healthy....
but why do i feel like this....
can anyone tell me...
FRUSTRATED!!!!!