Ambulances don’t really “treat” you, except in the simplest of cases. A paramedic/EMT is not a doctor. Their training is largely in stabilizing you, that is, making sure you don’t die before you get to the hospital, where you enter the triage system. They haven’t treated you, they’ve only done their best to keep the problem from getting worse. (I’m not saying this isn’t a valuable skill, just that it’s not the same as “kind of treating” you)