Hi there. Im a bit surprised by some of the responses that you need to put your big girl pants on and stop being prescious. Just because one person managed in a similar situation years ago, doesn't mean that everyone will (just like Covid - some people had huge mental health difficulties afterwards, others didn't) .
I don't know London at all, but you've said that the area you've moved to has high crime rates and you feel unsafe leaving the house, and it's effecting you to the point the point where it's impacting your relationship , you're taking medication and having therapy. When something is having this big an effect on your life, you don't deserve to be hit with "just put your big girl pants on".
I'm in a somewhat similar situation, for different reasons. Our house needs a LOT more work than we realized. Eg leaking roof, failed damp course, forty year old kitchen, I could go on. It would actually cost more to sort it all than it would to buy something that needs no work. Will be moving in the next few years, but can't afford it right now. It's our own mistake for not being more realistic when we moved, and I'm sure some people might think I should just pull my socks up - but it definitely gets to me.
Things I'm doing..
Buying little bits to brighten up the house. Just things like cushions, throws etc, nothing pricey . But (a) it makes the here and now nicer (b) it will help 'stage' the house when we do sell, and (c) we can take them with us so it's not money wasted.
Doing some minor improvements. There's only so much we can afford to do as saving to move - but am spending lots of time painting etc, makes me feel a bit better even though it's just superficial stuff
Looking at Zoopla / right move etc, at places we've ear-marked for our next move. Sometimes I even have a little walk around the area we're thinking of - it gives me a bit of a lift to know it's something we're working towards.
I'm sorry you're finding things so difficult. It doesn't make you prescious or ungrateful . You're just finding things really difficult right now. It will get easier and it's not forever. Be kind to yourself.