My father's sister also suffered for periods where her heart raced and skipped beats (Atrial Fibrillation Afib) and she was on beta blockers. She had to have several ablations...a medical procedure to shock the heart back into a steady rhythm. She would not stop drinking coffee or smoking...but she lived to age 88. I am 70 and besides the usual arthritis et..my heart is absolutely fine. I am sure you will also be fine. But until you see the cardiologist, stop all stimulants...even tea unless it is decaffeinated. I will bet you have no more episodes. And get exercise every day.
Are you taking any other drug that can cause your heart to react, such as thyroid medication? Are you taking decongestants for a cold?