What Causes Low Heart Rate And Chest Pain While Suffering From Anxiety?

Hello, I m 5 10 and I m over weight and I ve noticed lately that my resting heart rate is lower than normal. It is usually in the 70s but every now and again lately its 55-65. I know that s a normal range, but not for me. I was having some chest pains recently and received a Holter Monitor from my doc which came back normal, listing my average heart rate as 90. I usually have a higher heart rate, and I have generalized anxiety. I m worried that the chest pain isn t just anxiety, though they keep telling me it is. This is unlike any anxiety symptom I ve ever had, therefore I m concerned. After a few ER visits though, they say it s anxiety. It s very frustrating. I m worried about my heart health. I am losing weight, but the chest pain scares me. Any advice is appreciated. Thanks.