When we were kids, my brother was literally doubled over with pain, so Mom called our family doctor. This doctor was the old fashioned kind -- back in the day before there were all these specialists, he was a general practitioner, gastroenterologist, ob/gyn, pediatrician and a few dozen other "specialties' all in one. He still made house calls. And he could accurately diagnose without a lot of fancy tests.
This doctor came to our house, stood in the doorway of my brother's room as he was moaning in pain; then this doctor said to my parents "it's his appendix. We have to get him to the hospital immediately." Didn't wait for an ambulance. The doctor put my brother in the back of his car, then with my parents following him, they sped to the hospital. My brother was operated on right away. Our doctor was right -- it was the appendix. The doctor told my parents if they had waited much longer, the appendix would have burst and it could have been fatal.