Don't panic for a start. I have had it almost right thru my career, to the point that I could not lie on my left side without my heart start playing up, and missing beats. There are two types one dangerous if not treated, the other harmless. Mine was harmless but rather frightening at times, as I have got older it now needs treatment, and I require warfarin to stop clots. My career lasted 49 years so I imagine will yours. Get your self fully diagnosed, you will hopefully find your concerns are not as bad as you think.