I think there's a lot of comments on here that are judgemental and very unfair.
You don't get high rate PIP for no reason. It's notoriously difficult to qualify for. It's also not bloody easy to get ongoing support from mental health services right now. The fact that the OP's DH has both suggests that actually he really does have significant mental health problems.
We all talk about taking mental health difficulties seriously, and the importance of taking care of mental health....and yet there's an enormous pile-on here on this thread ridiculing DH and his MH problems, dismissing his difficulties. This is the perfect example of people with MH not being taken seriously.
I also think that if a woman was describing this kind of MH problem with high rate PIP granted and ongoing support from a mental health nurse, no one would be describing her as lazy or denying that she had a genuine medical condition.
The problem is that multiple things can be true concurrently and that's what's conflating the issue.
*DH has significant MH difficulties.
*DH manages to keep his head above water and manage his symptoms by the lifestyle he leads ie/staying at home.
*DH may also be bloody lazy and using his MH as a reason not to help out more with the chores. Trouble is, difficulty with chores/activities/motivation is also a symptom of depression/MH problems so hard to say which one it is....
*DH is perfectly entitled to stay in his own home 24/7 if that's what he wants to do. No one should HAVE to leave their home to make someone else happy.
*OP is perfectly entitled to want some personal space in her own home. It's bloody hard to be around other people 24/7.
*OP is understandably grieving the marriage she had, the lifestyle they led, and what she thought she was going to get from her future life
The trouble is that many of the above things are in conflict. OP needs a space of her own to be able to figure out what she wants, and what her future looks like. DH doesn't want to leave his home which is also fair enough. The only suggestion that seems viable is creating a space somewhere in the home that the OP can escape to - loft conversion? Summer house?
Some of the comments on this thread are shocking about DH having "no life" and "just existing". Some people are perfectly happy just being at home. Just because you wouldn't feel fulfilled doesn't mean that other people aren't either. There's such sweeping condemnation for people who don't fit the societal norms. This man has MH problems which qualify him for high rate PIP - and to suggest MH professionals are "enabling him" is quite frankly ridiculous.
Sometimes with MH difficulties, managing the bare minimum is all you can do. And you might function pretty well in that environment - but try to take even the smallest step and it all comes crashing down. It's very clear that some people here don't understand that not everyone can magically recover, even by pushing themselves. Not everyone is able to push themselves, sometimes it's just too much.
OP is understandably fed up. But honestly, she said they had a big row - and that was caused by her coming down at lunchtime and sniping at him for not moving. How is that helpful?!
OP needs to think about whether she can live with this situation, without constantly picking and causing rows because she's so resentful. The current set-up isn't healthy for anyone and it's not fair to the DC to have parents who are bickering and causing an unpleasant home atmosphere.
I don't know if it's possible but I wonder whether OP could talk to DH's mental health nurse about the impact on the wider family, and whether it would be feasible for him to take a more active role, at least within the home.
And just for the record, my DP is at home 24/7. He's not been able to work due to ill health since September 2022 and probably won't ever go back to work. I have two home educated DC who are both autistic, and one with high needs. I work F/T but I'm self-employed and work from home. I CRAVE some me time and peace and quiet. One of the DC needs support through the night til around 4am or so. I get it. I get how exhausting it is being a carer. Especially when you have to work as well. And I get how it can feel unfair that the sick person gets to sit around and watch TV while you're juggling it all. I am in the OP's shoes too so I really do understand what it's like.
But the reality is that our partners didn't choose to be sick. I'm sure they would rather not have gone through what they have. And sometimes recovery isn't quick or straightforward. Sometimes it's just not going to happen at all. Mental health is particularly difficult - it's not like rehabilitating a broken leg.
What you need to figure out OP is what you actually want to do, and what you can live with in the meantime without constant resentment and frustration bubbling over. You deserve to be happy but your DH also can't help being unwell. It's a shit situation for everyone and it's about making choices that are right for you.