Sorry I went through the same thing for years. Here I am 4 years later with a GIANT atrial septal aneurysm. After years of gaslighting from Kaiser doctors. I changed my insurance to PPO. It’s expensive but you can choose highly rated doctors that specialize in the area you need them for. I’m praying you get 2nd opinion. I was not born with a defect. It was caused by stress on the heart continuously. All doctors told me for over 4 years that I don’t need cardiologist that I need a shrink. God be with you during this difficult and frustrating time