I have seen this rhythm quite a few times and your cardiologist is on track in my opinion, however, I am not a physician.
Sick sinus syndrome is the name for a group of heart rhythm problems (arrhythmias) in which the sinus node — the heart's natural pacemaker — doesn't work properly. Sick sinus syndrome can occur in people of all ages, even infants .
Treatment for sick sinus syndrome focuses on eliminating or reducing unpleasant symptoms. If you aren't bothered by symptoms, you may only need regular checkups to monitor your condition. For people who are bothered by symptoms, the treatment of choice is usually an implanted electronic pacemaker.
Do push the button on the event monitor anytime you feel something that doesn't feel right.
Got you in my prayers my friend.