Well done for joining the choir. I was a member a few years back, but can't at the moment because my DSs are too young to be left on their own for long, and it was costing a fortune in babysitting.
My DH has severe crippling depression and I am left managing everything, so life is pretty bloody tough for me at the moment.
What I've decided to do is put myself first sometimes. When there's a lull in my work I browse MN rather than going downstairs and talking/dealing with DH, because I need my alone time and recharge time. Selfish, but very much needed.
I've decided that I can't be arsed dealing with crappy Christmas presents when we are struggling financially and it is a struggle to save up money for everyone to buy presents with (DSs are only 8 and 10 so only chip in with pocket money) so I've sourced a kindle second hand and that's going to be my present from the DSs. DH has been told and is currently 'suggesting' it as a great present idea, fortunately they're quite open to suggestions. He's getting me an amazon voucher with the equivalent of a 12 month subscription for Kindle Unlimited on it (again, he was told). No more jewellery, slippers and perfume for muggins here this year!!!
The sport is another thing. It's a women's team, and made of some mums who sit on the sides and watch our DC play. (Revenge is sweet, the DSs are sitting on the sidelines with their IPads waiting for me to finish playing. BWa, ha ha ha!!!)
The other thing I do is because life is so crappy, and things can easily get worse for us (we've got some pretty serious issues we're dealing with) I go through detailed worst case scenarios for everything. I've then put in contingency plans to deal with the worst case scenarios. So who will care for the DC, what happens to assets, earning alternatives etc. I've spoken to relevant people and got their agreements. This means that should the 'worst' happen, I've already done what needs to be done and those I care for will be cared for.
I'm also trying to 'bomb proof' myself financially. So I am finding several streams of income so that I am not reliant on just one. I am looking at some training courses that I can do, slowly, from home, for another future career (self employment - my trust and faith in other people is at an all time low right now, and I want to be in control of my own work life - I am done with being vulnerable).
These are things that are working for me. I hope some of it might be helpful for you.