Pulse ox 92%, bp 95/58, hr 48, no pacemaker, bp monitor shows irregular heart beats. shortness of breath, dizziness, and general weakness during episodes. what's likely the cause? is lying prone best way to recover from the episode?

While these values given are not specific , obtain a referral to a cardiologist, or go to an ER since weakness, dizziness and shortness of breath need more definitive testing for a diagnosis.

Unless your symptoms and signs warrant hospitalization, you'll be best served by seeing a cardiologist directly for evaluation and appropriate testing. Besides the physical examination,EKG, echocardiogram ,outpatient cardiac monitoring will be arranged to determine the significance of your bradycardia & irregular heart rhythm. When you're lightheaded & weak from low BP, lying supine is recommended