I'm sorry for your loss OP, please do whatever you can to help yourself feel better. I have been trying to up my game a bit this year, having neglected myself for the last few years with caring duties for my elderly father.
I probably spend more than I should, but it's my money, I have earned it and can spend it how I like. I definitely feel better investing in myself physically and mentally, so for me it's worth it.
For wellbeing:
Reformer Pilates classes, X2 a week - about €150 a month
Online yoga nidra class once a week - €40 per month
Weekly weight training at home with youtube is free.
Meeting friends for chips or ice-cream along the pier once a week or so, maybe €30 per month.
Good quality coffee, delivered monthly - €30 a month - some days it's the only thing that gets me out of bed.
For beauty and style stuff:
Full head of highlights and a cut, 4 times a year @ €160 a go
Contact lenses about €60 for 6 weeks.
The only 'professional' thing I get done is my hair - for nails and fake tan, I do it myself if I can be bothered, usually if I'm going out. I have a Revlon One Step, which gives me as close to a professional blow-dry as I can manage at home.
I will also look into getting botox in the next year or so, as I'm approaching 40 and want to try it, not sure how much that will cost.
I don't spend that much on makeup, but the stuff I like is high end brands, Georgio Armani foundation, Laura Mercier powder, Benefit blush, YSL mascara. I only buy refills once or twice a year. So maybe €200 per year.
I spend more money on skincare than make up - Vitamin C serum, tretinoin, niacinamide serum, and good daily sunscreen, plus moisturiser and cleanser. This probably comes to about €50 per month in all. I also have an LED face mask which I use regularly which was expensive, about €400.
I'm not big into fashion and don't tend to buy clothes often, although I've bought a few more expensive items recently from Poetry and Hush that are good quality and hopefully should last.
So that all comes to maybe €400 or €500 a month - that probably makes me high maintenance to some, but I don't give a shit - I feel better for it. Overall, I try to invest grooming and fitness, so that even wearing my usual jeans and a t-shirt I feel confident and fairly put together.