I think it helps to start acting as if you think you look nice, even before you actually do!
When I was 45, I'd gone downhill horribly quickly. I gained 4 stone really fast, stopped looking after myself, lived in baggy jumpers and jeans, and just lost my way. Then I started watching beauty bloggers on YouTube for some reason, and noticed loads of them we're the same size that I was but still bothered to wear nice, fashionable, thought-about outfits.
I joined WW and that cheered me up, and I started caring about what I wore, and my hair and make-up, even though I wasn't anywhere near my ideal appearance.
It REALLY HELPED.
So while you're saving up for Botox, etc, I'd go through your wardrobe and ruthlessly throw out any old, frumpy, scruffy jogging bottoms, shapeless hoodies, etc, that you know make you feel fat, old and ugly. Just bin them.
Go to Primark/January sales and buy a new lot of inexpensive clothes. A mix and match lot of nice jeans, tops that fit, flattering jumpers.
Then get your make-up done on a counter, and buy some fake tan. I said it already but it bears repeating: it completely lifts your mood and makes you feel thinner!
Then tackle the middle-aged spread because that'll also be making you feel bad about yourself. I'm older than you and recently skinny. It's totally possible.
Little things will help. Much more than you think. And the more you act as if you're happy with your appearance by nurturing it, pampering it, the happier you'll feel.