Maybe he’s finding it difficult to process.
I think 3 days is ok really, especially if he’s never been ill. And he was maybe googling and had heard about all the possibilities of complications, which you can’t evaluate enough at 3 days.
Honestly I would try to let him have his little moment to process if it’s only been 3 days, we all react differently.
As a reverse example, I’ve been in ICU for pneumonia and am since terrified of the slightest sign of cold. It’s not rational, I know, although I’m technically still a little vulnerable to anything respiratory, but it doesn’t stop me from layering up a bit overboard. Maybe the reverse if he’s never experienced it. Hospitals can be horrible places, even if you’re fine, ex me I survived, you see people around you who really aren’t. I still have nightmares from the people I saw die in my ward who couldn’t be resuscitated.
Its obviously not the same context, but the idea is people react differently.
Id be worried about the painkillers though. Encourage him definitely to see a GP, he will also feel supported. Taking occasional painkillers is not normal for recurrent pain. Maybe he’ll be reassured by the GP checkup.
I don’t think we should be too hard to judge, everyone experiences things differently, and any medical procedure especially (I started off with a simple pneumonia, waiting times took ages, then my friend found me unconscious one evening and ICU)
I think the GP could definitely help, a safe space to talk, and a checkup