See your cardologist as soon as possible
and report the incident
and others, if any. The concern is that you might need a pacemaker to prevent these slow episodes from happening, so that your tachy episodes could be safely treated.
2. IF you are taking beta blockers (metoprolol, atenolol, etc) or calcium channel blockers (diliazem, etc), you might want to stop it due to their heart rate slowing effect--PLEASE call your doctor before doing this.