question: SIr i am 24 years old unmarried boy. my problem is, when i over do some thing like pushing a car of my neighbour using my force and running . then after some distance my heart rate increases but beside it my down teeths feel tension , my body loses strength , i feel colapsed . i just laid down to calm my self , i recover when laid down. but i feel there is something wrong , it is a very bad feeling .  it is not usual heart beat .  I do heavy work with no problem but . when running and pushing work comes i fail.                   plz help.