Looking for a doctor/endocrinologist

Hi, I am a woman in my 30s, looking for a good doctor. I got some preventive health check ups done along with some hormone tests. Have consistently low levels of vit b12, calcium and vit D3, along with pcos (has been there for ages). I had consulted physicians before but apparently they didn't take it seriously. I am dealing with brain fog and other things and looking for a good doctor who can suggest supplements or medicines to correct my condition.