@togo1004 you are placing a hell of a lot of blame at your fiancé’s door. Please look at this list of your behaviours towards this man:
You have said you blame him for your eating disorder.
You blame him because you drank too much coffee and triggered your anxiety and he should have rearranged the tradesman visiting.
You blame him for making you feel pressure when you overheard his tone in the shower (which was not directed at you) and felt triggered.
He has asked you to record yourself. There is a reason for that. Your behaviour is unhinged.
You demanded he be the one to fix your feelings by saying he hadn’t done enough reassurance and it was his fault you felt the way you did.
You accuse him of sounding negative (through a door!). Then you blame him for being defensive. (By the way: people tend to react defensively when you accuse them).
You go out for a dinner date, but you don’t get to walk afterwards (as he was struggling with his breathing) so according to you that doesn’t count as a proper date. It was just eating. It wasn’t good enough for you.
You blame him for going out with his friends because that makes you panic as the thought of him having fun without you is panic inducing.
You have health issues that prevent you doing half the chores.
You have debts that mean he supports you financially and, according to you, has very little left to spend on himself.
He’s allocated two evenings a week to discuss your feelings, but you blame him for not listening to you enough.
You’ve hit him once (but it’s because he didn’t mind and you were sorry).
You’ve told him you’ll die if he breaks up with you.
He has previously been abused by an ex partner. I think this poor poor man has a very low bar because of that and he is allowing you to treat him this way. If you really loved this man, and I don’t mean in terms of what he gives you, then you would do the honourable thing and set him free of your toxic behaviour.
I know you’re getting help (one session of therapy is about 0.1% of the work you need to do on yourself) but your issues are going to take YEARS of hard work and reflection to address. In the meantime this man is your victim. I know you don’t see it like that. Everything you’ve described makes it sound like you think you’re the victim (just read the list of things you blame him for!). But your perception is the issue here, not his behaviour. He is being massively accommodating. Too much in fact. Because he is enabling your toxic behaviour.
Likely he has been damaged by his previous relationship to the point where he thinks this one is better and therefore ok. But it isn’t ok. Your treatment of him is absolutely awful.
Please listen to the unanimous voices on here and let him go. You need to seek help. Much more help than what you’re currently getting. You are a long way off being able to be in a relationship. It is unfair to keep him in this one.
These are your problems. They can’t be sorted in couples therapy. In fact the advice is that couples therapy should not be attempted with an abusive partner. And hard as it is to hear: your insecurities and anxieties are causing you to emotionally, physically and financially abuse this man. Please do the right thing. You say you have no friends left. There is a reason why everyone is backing away from you. You’re not fit to be in any relationships right now.