What should I do with £1k

[ThatWorthySheep]

I have had a letter to say they’ve underpaid me £1k in benefit payments. I get adult disability payment and universal credit, my mental health is a state and I can’t work. I have untreated social anxiety disorder, panic disorder, possibly PTSD and I’m waiting on getting a psychiatric referral. I have just come out of a depression that I was in for a year and have a few hobbies. I’ve already made my bedroom cosy but I have insomnia and can’t sleep at night. I’m also agoraphobic, so going on a trip away is probably out of the picture. I’m getting all the support I can for my mental health, but the services are crap and waiting lists long. They keep trying to give me CBT, but it’s just not working for me. I do meditation, PMR and Pilates at home each day. I have a dog and a small garden that I want to do up as a relaxing space with potentially a pond and a lot of plants, maybe even a tree and fairy lights, a place to grow some flowers/shrubs even vegetables, but I’m not interested in the modern look, modern furniture or spending a lot of money.
i think I’ve got enough money to live on, my gas and electricity bills are low, I just use an air fryer and I already put away money each for future vet bills, I didn’t have insurance for my dog and then she had an issue so insurance wouldn’t cover it if she got a problem again. I already put away money for the various things I’d need to buy throughout the year and money towards a buffer incase an appliance breaks.
i’m in pain when I stand up and walk, I am self medicating because I can’t get to a GP due to the agoraphobia, but I’m meant to be getting a home visit at some point. They wouldn’t give me high rate mobility and I don’t have the energy to fight it especially if I just lose my claim altogether so I won’t get a mobility car. Main issues with my agoraphobia are leaving my safe space and severe social anxiety. I maybe want to spend the money on something that would me an additional income, but my energy levels are really limited and I can’t commit to making things to sell or it feels like a chore and I feel depressed again so I mean something that would just generate money by itself and I don’t really have to do anything but I don’t know what that would be or if it even exists?

Could you invest it in private healthcare?

Out of all those things, the garden sounds like the most beneficial and achievable so I'd focus most of it on that, but no need to rush.

For a start, just put the money in a savings account so it earns 5% interest (also make sure all your other saved money is in the same place, but make sure you don't exceed the UC capital limits - if it looks like you are at risk of this, you could do things like buy supermarket vouchers or just keep your store cupboards topped up). Plus if you've never had a Help to Save account, make sure you open one of those.

Then start thinking about the kind of things you'd like to buy and browsing for ponds, trees, comfortable seating etc. You could spend some of the £1k on a gardener/handyperson to do the physical work of installing the pond and lights and plant a tree. I'd have thought that all that could take a good chunk of the money.