Heart palpitations

Friday night I was having this breathless feeling scariest feeling in the world. Had my husband listen to my heart and he could hear it double beat. So I panicked rushed into emergency. They did blood work ECG 
Urine test. Everything came back normal they showed me where the heart palpitation was. They advised me that it's not a bad thing and about 90% of people have them. But I focus all the time on it so I notice it. But even though I seeked medical attention why can't I stop worrying that something is wrong😞 I am 9 months post partum with my second son and on 100mg. Does anyone else deal with palpitations everyday? Please help I am so exhausted from worrying