My wife once phoned me when I was away abroad to tell me her mother had taken ill in the afternoon and she described the symptoms. My immediate reaction was a sense of 90% certainty she had had a heart attack. My wife told me her doctor promptlyu saw her and prescribed tablets for indigestion. My wife then continued the story and described how the next day she again called in the doctor and a stand-in came to visit and immediately ran for the telephone to urgently summon an ambulance. My mother in law died from the heart attack within two hours of reaching hospital when they had a nurse sitting beside her to monitor an infusion of medication in the hope of saving her. I should point out that I have absolutely no medical training or anything remotely resembling it - but I do take note of passing information.
I could tell you numerous stories about friends and relations involving crass incompetence on the part of the medical profession, including something that is a direct equivalent of your friend's experence but unfortunately my friend died from the cancer she had suffered for a long time before she collapsed at a hospital when taking a friend there - the staff there promptly correctly diagnosed her affliction.
If car mechanics made such a pig's ear of servicing our vehicles we would be outraged - and please nobody start on about how the body is so mysterious and/or unpredictable. If civil engineers were as incompetent as some members of the medical profession then we would have structures (bridges, dams, towers, large buildings) collapsing all the time and not just in countries where floors are unwisely/illegally added on top of buildings. To be fair, these medics are not a manifestation of useless training regimes or an inept system of some kind - it is their complacent arrogance and inclination toward seeing themselves as infallible superhumans that is the problem and there some of society at large may be to blame for regarding them as s