ECG says Sinus Arrhythmia. Is it ok?

Gallbladder stone. And for laparoscopy surgery I underwent some medical tests including ECG. My ECG report says "Sinus Arrhythmia" I want to know whether it's a matter of concern ?are my ECG reports normal?or is there any issue in it? And also if there is any issue ,will it cause any hinderence in my laproscopy process? I want to add my symptoms to your information: 1)Since 4 months,I am facing severe acidity issue. 2)I get a lot of burps and hiccups many times a day and feel nauseous. 3)I am facing severe acid reflux. It sometimes make me feel nauseous and I feel some liquid traveling up my food pipe upto my throat. And I feel pressure around my food pipe area and in my chest area.and I feel shortness of breath also many time a day. All of this gets supressed when I lie down. I am unable to understand that this shortness of breath is because of gall bladder of is it due some other cardio issue according to my ECG report?