Over the years, I have tried loads of diets, with some temporary success, but all goes back on eventually.
PCOS and insulin resistance is the perfect storm, and if you add in not being able to move much, and the pain, not surprising weight loss seems out of reach.
I know you say low carbs recommended, but is that refined carbs and sugar?
The usual advice churned out is wholegrains blah, blah -I'm sure you know it off by heart by now.
Wholemeal bread is often white bread with brown coloured flour. Finding a decent, nourishing bread is a good place to start as you won't need much to satisfy you.
Feeling hungry isn't good, neither is deprived. Nourished, satisfied, are good words.
Single source foods rather than processed, lots of veg, bit of fruit, and ease up on the failure frame of mind.
I've started to use an app to keep a rough tally of calories but don't get fixated on it. Physillium husks can help if you get constipated.
The pear forum is good to check into sometimes if you need some support. Feeling that you aren't alone in your struggles is a great help.