Drs keep telling me my symptoms are due to anxiety when I know it’s not

I’ve been having chest pain and difficulty breathing for several weeks now and drs aren’t taking me seriously. I’m not anxious at all and that’s not a typical anxiety symptom for me. I never get chest pain except for when I had covid last year. Several years ago I went through this same exact scenario where drs wouldn’t believe me, and eventually one finally did and it was cancer. I also had a similar situation when I was a kid and it turned out to be a food allergy and everyone blamed it on anxiety. How do I get drs to take me seriously!