my situation evolved differently than yours. I had NO chest pain and did have one similar incident of heart palpitations around 2016.

In 2016 my heart was briefly racing so i went to the ER thinking i might be having a heart attack. The only thing that was abnormal was that my TSH level showed i was hyperthyroid. (An EKG was done). The ER dr told me that i was hyperthyroid and that was the source of my tachycardia/heart palpitations. As followup, i went to both a cardiologist and an endocrinologist. The cardiologists prescribed an echocardiogram and a holter monitor

I had lots of tests and was diagnosed with thyroid autoimmune disease, graves’ disease and hoshimotos.

Heart tests were normal. My cardiologist insists that if an echocardiogram a normal than it’s unnecessary to do a stress test. My cardio is head of echocardiogram dept for Cleveland Clinic Florida.

For the last week or so, i have been using a zio, a type of holter monitor. They have been sending my cardio daily reports.