The world sucks right now. We're literally burning through it and it is hard to find happiness in. The depression comment sounds about correct to me, but I would add that some travel will help with perspective. Tap up an old buddy, give that strange aunt a call, go visit somewhere else for a week. Somewhere beautiful if you can. And if you can't, read instead - libraries are free and offer an easy escape. You need a break, we all need a break.
Then set some short/medium term goals. A skill, a sport, a model, a hobby, a partner, a new flat/car/job. And pursue them a little every day
UK GDP maybe 2.5tn. So like 0.5% of one year's spending. Just hand it over ffs and be done with it