i m a tall boy of 18 years.i m totally fit and also i m black belt in karate...i left practicing karate 1 and half years ago due to too much study burden.....but i am very keen for bodybuilding too,,,but due to my studies i cant join gym my father dont let me go.......so 2days ago i did 30 continues push ups in courage....(when i was practicing karate i used to do almost 40 continues pushups in every 2days) ,,,,,now from last 1 day i m feeling too much pain in my left chest sometimes it extends too much and my left also gets too pain.......i feel my chest tighten.....when i walk for just for 1km this pain got even worse....and i started feeling it hard to breath properly.....,,,,,,,,,when i bow downward the pain again rises and i feel that my heart is pumping too fast...............i used to walk approx 10-11km every day but now from last 1day and also today i feel it very hard to walk even 1km......whats the cause..........how to cure...........doctors are too expensive.......and ..........ya one more thing ......my exams are ahead i m pretty tensed alsoo........could u plz help me.........