Presuming my money problems also vanished, I would definitely travel. I would do things, a lot of things actually, there's so much I want to do, but I can't even afford food at the moment.
Of course my mental health wouldn't improve overnight, however, doing the things I enjoy would certainly give me something to focus on. Plus, I always sleep better when I'm elsewhere, so it would help instantly!
If I had money right now, I'd jump on a train, go somewhere, and book a hotel for a couple of days. Even if it meant just eating shit and watching films on the TV, I would certainly come back feeling a lot better. I always do (when I used to see a family member once a month, years ago, I did this and felt so much better for it).
I would also give therapy another go. Private therapy, with the same therapist I had recently, because he is the only one that's ever really listened, and helped me, but unfortunately the NHS only allows for 4 months worth of sessions, which isn't enough.
Yeah... if I had money, I'd be so much better off. No more worrying about when I'm going to get my next meal, or afford to pay my bills. My life would improve dramatically, and in turn, it would ease my suffering, too.
Even just the little things help, you know? I would love to sit by the beach, eat a bag of chips with curry sauce, and listen to the sound of the waves crashing, watch the waves crashing. So peaceful. I can't even afford to do that though. That's my safe place. Definitely