Somtimes my heart beat seems fast & slow. I felt i was about to struck down while standing. 2 days back, my breath was about to lost. All my fingers, legs & whole part of my body was cold & sweating. my Parents massaged me, but no improvement. I thought i was about to die because i was severe, my heart beat was beating rapidly & i couldn't breath. Doctor gave me DNS & some injection. I got somehow relief. But i am still not that healthy. What could be the problem?? Please help me.