I agree with those who suggest you reach out to your docs. I will say that Nammu's suggestion to cut down on caffeine is flat out sound advice. If I recall correctly, you do claim to consume a lot, sometimes.

Hope you feel better soon and any anxiety eases.

I have had tachycardia in the past. I was prescribed a small dose of a very side effect friendly medication. I still take it. Nowadays my heart rate is normal.