I had a bad case of COVID in August 2022. The high heart rate of 136 started about a month later. I went to a cardiologist and had a stress test done and all is well. It's from COVID she said. My heart rate finally calmed down a few months later. I also have thyroid issues which can cause palpitations. I can see how a high heart rate/palpitations can make you feel anxious. You are very aware of your heart beating and the palpitations. I pray this calms down for you. If not please, see a Cardiologist for a work up or an Endocrinologist. COVID can do some crazy things to us. God bless you! I care.