Heart skipping beats while exercising.

Hi, I've been having palpitations since Feb 2024 due to my thyroid condition and took inderal 20mg. I checked ecg, 2d echo, tmt, and holter in May, and everything was normal. Then i lost weight due to vitamin b12 deficiency again. I checked cardiologist in September, and stress tmt had t-negativization over II,III, and avf (secondary ischemia), which the doctor told me everything is fine. Again, I started getting heart skipping beats in November, and i took ecg, 2d echo. The doctor told me it's normal and told me an inderal to take occasionally. But for the past few days, I've been getting heart skipping beats that, too, while exercising. I'm already have health anxiety and am very much worried about this. What should I do now?