Hi OP
This has only just popped up so might be a little late but my experience with DS15 last year with burst appendix and blood infection. By the time we got him to A&E he was grey, purple lips, violently shivering and shallow breathing. Two hours before he had “a bit of stomach ache”!
The appendix was very badly burst and left pockets of infection everywhere. He had 14 days in hospital, managed three days at home before being in serious pain and going back in for 48 hours.
The pain that comes afterwards is trapped air from the cleaning out procedure and is apparently very common. DS had more pain with this than the original appendicitis!
He had four separate courses of antibiotics and it took around six weeks for the infections to fully subside. He was exhausted for around 6 weeks too - to the point of barely being able to walk across the room. He certainly couldn’t manage stairs and had to sleep downstairs.
It was about 9 weeks before he was close to being back to normal pain wise. But he was still very tired. He missed a lot of school - for a whole term he either wasn’t there at all or was on reduced days - he fell asleep by midday. Every single day.
It took six months for him to no longer need a nap in the daytime.
He lost nearly 2 stone in weight. However he did put it back on in the last six months or so.
It really knocked him out so prepare for what could be a long recovery.
Hope he’s okay soon.