My situation is a little different in that my disability precludes me from significant exercise. I mean literally I can't so much as wear socks without my leg swelling up to double or triple the size, never mind the pain etc from merely standing.
At my worst a couple of years ago I'd hit 38st with extremely low testosterone, was type 2 diabetic with an undiagnosed gut issue that resulted in extremely frequent, painful and bloody diarrhoea. I've also dealt with obstructive sleep apnoea for 15 years and had a list of medications as long as my arm, that came with there own side effects.
I'm a sugar addict with seriously poor impulse control when it comes to the stuff but I turned to the carnivore diet after hearing about it from Jordan Petersons daughter on some podcast.
Over a period of roughly less than a year, I dropped to 26st 7lbs (currently 28st 13lbs as I fell off the wagon) I put my type 2 diabetes and gut issues completely into remission. To the point they couldn't find any evidence of my gut issues and I was discharged. Do you have any idea how emotional you can get when you have your first firm poop in years? I felt like I'd been pegged and was happy about it.
My sleep apnoea improved but wasn't cured, I'd need surgery apparently. And my low testosterone and other thyroid related issues all massively improved. My diet while restrictive, really wasn't difficult. I didn't count calories or do macros etc. I just ate fatty cuts of mostly meat, fish, eggs, butter etc and stopped when full. I felt so much better!
I'm back to carnivore now, and currently pre diabetic and hoping I can stick to it now without anymore derailments as it takes me a long time to get to grips with myself. This is all anecdotal of course, while there are studies to this effect its still not mainstream however a quick Google and you'll see many thousands of people with similar anecdotal stories.
I'm sharing this again as I'm hopeful it can help here, no pushing just sharing my experience with it.
I qualified for gastric bypass etc and was even offered Wegovy or possibly Ozempic but I refuse to go under the knife or inject myself with something even the people who make it don't fully understand.
Whatever you decide to do, good luck to you mate.