Sinus arrhythmia. I over come that.

Hii doctor i m male aged 23 years. from december i am having pain in my chest and in the back i went to hosp and they said its because of acidity and later again i got a sharp pain and went to hospital, then they did ecg,2d echo...and they said i have trivial Mvp...i underwent all these in february. now in june on 22nd i went near famous cardiologist and they took ecg,2d echo and tmt...they said all are fine..there is no MVP too.. i said i have that previously...they cross checked again by doing 2d echo..and said there is no mvp.. i saw that there is something in ECG like sinus arrhythmia...what does it mean doctor...is it harmful...how should i over come that...any natural cure or else any medications...please help.