I'm a Paramedic and in medical school, what relevant medical professionals are you talking about?

I can tell you exactly how this call would go. Given age and symptoms it would get triaged as a priority 5, which would (under the current workload) mean we wouldn't get to him for 8-12 hours. At which point he wouldn't want us anymore or would have done the appropriate thing and called a "nurse on call" line or gone to a GP if concerned.

If it was a weird day, and for some miraculous reason the workload was low, and we got to him in an acceptable timeframe, we would do a basic set of obs and then explain to him that there's nothing much we can do for him, and while we can take him to the ED he'll likely be in the waiting room for hours vomiting his guts up (and likely shitting himself), and that he'd be much more comfortable at home. We'd enquire if someone could stay with him, and then we'd leave.

He if insisted on going to the ED, regardless of how busy the ED was, he'd wait several hours. Triage nurses have unwritten policies that if you're going to waste the EDs time they'll waste your time.