Hiya, I don't really have anything super helpful to add here in terms of the process for getting things sorted out/corrected - but I do just want to give some info about my families experiences with this type of thing in the hopes that it might give you a tad more confidence to stand up for yourself.
Please do not let medical staff fob you off because they think they're impervious to making mistakes.
Do not let this go, and definitely do a formal complaint. I have so much respect for medical staff, but the fact that you had concerns and they ignored you and insisted they were right and you were wrong multiple times is absolutely disgusting and vile imo, especially with something so serious.
My mum in 2022 had a relatively routine knee surgery that ended up uncovering a Grade 2 Meningioma brain tumour when she had a seizure coming round from the sedation, and frankly the way she was treated was also disgusting.
She was given no "Post tumour diagnosis" info or support, was left to fend for herself basically.
She had to go on a certain type of seizure medication which increases the likelihood of kidney stones (She was not warned of this), and of course, she got kidney stones (But at the time obviously she had no clue what was causing the pain so it just got worse and worse until she couldn't take any more).
She was in so much agony she phoned for an ambulance, and despite telling them about her recent diagnosis, and how she'd waited until the pain was unbearable & that she was due for literal brain surgery soon, they told her it wasn't a life or death situation, or even an emergency of any kind.
So she ended up phoning her GP who told her to take a taxi to A&E, where it turned out, she didn't have just kidney stones, but also severe sepsis, bordering on septic shock because the kidney stones were blocking some tube and she ended up needing a stent put in.
(For some extra context, my mum had to have a C-section when I was born, and she ended up with severe gangrene and nearly died having me. The only reason she survived is because she was on the larger side, so the infection was eating away at fat more than anything else. So bottom line she's fairly susceptible to infections & sepsis so this was really scary for us, and when visiting her in hospital, I genuinely thought she might die a few times, she looked so so poorly, she was basically grey)
The people in hospital said she was insanely close to septic shock. And she ended up in the hospital for well over 3 weeks, all of which added massive delays to her being able to get the brain surgery on the Meningioma - Bearing in mind she had to go through all of this without knowing whether her tumour was cancerous or not, or if she was going to live or die.
My mum had to REPEATEDLY remind the nurses & doctors almost daily that she had a brain tumour. They literally forgot. They did it whilst I was there visiting at least three times.
She had to repeatedly remind them that she was on other medication for the tumour and seizures and that they were time sensitive, and again and again she was given medication late or not at all, and we had to follow things up for her.
She was on some kind of what I assumed was antibiotic drip for the infection which they messed up every single time it needed changing. The entirety of my mums arms were deep purple from bruising. They caused 2 or 3 veins to collapse, the list literally goes on and on, I'd be here all day if I listed everything.
Bottom line; DO NOT let this go. This is not something minor and your hospital needs to take accountability.
If my mum hadn't have phoned the GP, and then gotten herself in a taxi to A&E, she would literally be dead right now she was that close to septic shock. The staff literally said so when she finally made it to where she needed to be.
I understand that the NHS is incredibly understaffed, underpaid and they're stretched thin, but that's not a valid excuse to be dismissing patients valid concerns simply because the hospitals think they know better.
Yes they have more experience medically, they know the what, the why, and the how, they know what they're doing.
But they're also human, they also make mistakes, and you won't have the same doctor every time, it's literally impossible for them to know for certain if what's on their notes is correct unless they were there the last time and for some reason decided to remember you specifically out of the hundreds and thousands of patients they see on a daily basis.
I really really hope you get to the bottom of this mess, you're in my thoughts, I believe in you, don't let them shut down your extremely valid concerns <3