Ideas and recommendations: (I'm no doctor, but this is what I have experienced and learned by reading i.e. this forum.)

1: (which you seem to have done already): Get your heart checked by a doc. ECG and so on - to ensure there is nothing wrong with it.

2: If your heart is cleared, then try to accept that your palps are not dangerous in ANY WAY. (That might be the hard point ...)
But acceptence of that fact should in the long run reduce your anxiety and palps.
Think of the fact that vagus-induced palps, as they probably are, come from OUTSIDE the heart. Sort of wayward nerve impulses that can "hit" the heart anytime and make it beat and extra beat now and then.
Annoying? Yes. Anxiety-creating? Yes. Dangerous? No, not in any way.
Therefore: Don't let palpitations change your plans or projects. Go ahead and do whatever you want to do. At some point the palps stop.

3: Use techniques to reduce anxiety. Relaxation, breathing and so on. The 4-7-8-breathing excercise has helped some people.

4. What and when you eat and drink can trigger palps. Known "sinners": excess coffee, alcohol, food. Late eating of big meals might trigger them right when you want to sleep.

Best of luck.