You’re talking about a basic GP visit. The standard/expected practice is to prescribe ‘best guess’ medication and see if it improves. As you said you can get the equally bad treatment from a tired/sick doctor as from one who ‘despises’ you. It’s just a common risk everyone accepts so you’re comments about not wanting doctors who despise you treating you makes little sense. You can tell the doctor isn’t very good and go to another one. Where it could be important is a hospital visit and there are procedures to follow there. Doctor can’t just give you a sick note and send you home. If he does that’s malpractice.