That’s a really nice and interesting post @BuildingThings
However I do suspect that the OP may be projecting her grief into the house. Looking back when I moved and had a relationship breakdown at the same time, I put all my stress into the house. All I could see were the bad bits and none of the good bits. Tiny things became massive things to me. I thought I was behaving totally normally and it WAS tbe house I hated.
Anyway, turns out I don’t hate the house and when I became more on an even keel I grew to like the house and love bits of it.
What helped? I did actually do as BuildingThings suggested and painted the entire house (half myself, not all!) and had a new bathroom and new carpets and due to the circumstances I had to buy new furniture.
I had friends and family to stay, my friends were a great support in coming round with a bottle of wine and having a laugh with me and being nice about the house.
Oh, then winter ended and it became summer, and the beautiful garden was revealed out of the winter grimness. The house really isn’t nice in winter (freezing poorly constructed extension) but in summer it’s lovely.
Moving house is stressful. Grief is stressful.
If you still feel like this in 6 months Op then just move. Your DP has said he will. Make a plan. Save money up. But in the meantime maybe make one room really nice so you feel you have one space that is good for your soul.
Honestly if you’d asked me straight after I moved in I’d have torn you to shreds for suggesting my emotional state was affecting my views of the house... turns out it totally was!