It's a generalisation but in my experience I've found many doctors to be dismissive and keen to rush us out if the door when I've taken my DC.
As an example, my youngest has recently been very poorly, he's only 16 months old.
We went to the doctors as he was vomiting a lot, he couldn't keep anything down, not even water. He said it was a virus.
Two days later we went back as nothing had changed, he was still not keeping anything down. Saw a different doctor as it's impossible to see the same one twice. Virus.
Again we went back. Virus.
We went to the hospital a week later. He hadn't eaten for 7 days. Still keeping nothing down. Virus.
Day 10 - he was 7lb lighter. Lost 25% of his body weight. Still not eating. Saw GP. Virus.
Not one of the doctors did any stool samples, blood tests, it anything other than check his temp and announce that he had a virus. No one would listen, looked disbelieving when I told them how much weight he had lost. Seemed to think I was exaggerating.
Day 13 - finally saw a decent doctor who listened. My DC was seriously ill with a BACTERIAL infection. Needed treatment. If it wasn't for the fact that I was still breast feeding then things could've gotten very serious very quickly. He was basically starving to death.
I'm sure there are decent doctors out there. But in my experience they are over worked, jaded, and just want to get through patients as quickly as possible and end their day. I don't think it's entirely their fault - they are over stretched, given 5 minute appointment slots - how they are expected to do their job in 300 seconds I don't know! But something needs to change.