With the information you can find online these days you can often end up in the situation where you're 99% certain what the problem is and what needs to be done but you have to jump through hoops to get the treatment.
Problem is if you allow self referrals people take the piss. While back I ended up in A&E for 3 days because they didn't want to admit me but also didn't want to send me home. Chatting to the staff there there are numerous people known to them that turn up on a weekly, if not daily, basis but they can't just send them away and it clogs the system up.
Add in that other services have been closed so they're swamped with homeless people with nowhere else to go, people with mental health issues, alcohol & drug issues etc and its no wonder A&E has ground to a complete halt.
How many people wouldn't go to A&E if they could turn up at a local GP after work and see someone, how many people have zero clue about walk in centres, minor injuries centres etc. The default seems to be can't see a GP, go to A&E.