Still no point, and I say that as a doctor. There are no meaningful treatments for colds or flus until you're at the point where you're more or less dying from it, and even then it's mostly supportive therapy. The only thing remotely useful for seasonal flu and the like are OTC painkillers and nasal sprays, neither of which you need a doctor's advice to pick and choose between unless you have some other health issues. Cough medicines are either borderline hoaxes or rarely worth the side effects.
Look, I don't want to come off as disrespectful or numb to the fact that people who are ill want help. I understand that people without a medical degree obviousy won't be as able to differentiate between a mild and a serious infection as I am. But you really, really don't need and genuiney shouldn't routinely go to the doctor for conditions like common flus or stomach bugs. We can't help you with those. With the latter, we might even show you the door because that shit's dangerous to the older people you're going to share a waiting room with. Just stay home if you're not feeling so bad that you're worried about it being dangerous.
EDIT: sure, sinus infections and ear infections should be examined by a doctor because, as you say, those can be treated with antibiotics. But you came off as suggesting that people should routinely get a doctors examination when they feel ill, no matter how mild it looks like.