I dont know how you change but somehow you do.
I've been in your shoes, I probably am still there, where every bit of shit just still keeps flying at you and nothing you can do will fix the situations. Everything is out of your control.
We've had most of it here, major illness, job loss due to disability caused by illness, financial ruin caused by disability, then having a disabled child.
Then lots of other major/minor crisis that added up too.
Then noticing that friendships really fell away because I no longer had the money or the energy to contribute. Or I was hiding away from friends and ruining relationships because I was ashamed I wasn't the person I used to be.
Every special occasion or date in the diary, holiday, babysitter arranged or dinner booked was cancelled because of a medical emergency or a hospital stay until gradually we just stopped making plans at all and stayed at home. And our world became even smaller.
I went to the GP crying disappointed tears and was sent to CBT counselling. And spent 8 sessions feeling totally unheard as the Psychologist tried to tell me I was depressed, when I wasn't I was bitter and angry. My mother and DH have depression and I know how it can affect people. I knew I wasn't depressed. I was angry at my life being taken from me and that every small chance I tried at stealing it back was taken away again.
So, eventually I started to see each set back as one individual event, and not another load on the pile. And to try not to "pre plan for the next emergency" therefore putting my actual life on hold.
My mantra now is.... shit happens, move on.
So it's still the same, but my outlook has changed. I will book the dinners, they may be cancelled but maybe one will happen. I will book refundable holidays close to home.
I've reconnected with friends and explained about my 8 years living in a hole of self destructive anger and its been great to reconnect.
Worrying about tomorrow only uses up our energy we can't change the outcome.
It's a very hard road and I wasted so much of my life being so angry when I had enough to deal with, I could have been so much kinder to myself. And I think you should be too.
Sorry if this is a bit waffling, DH and I went out for a lunch yesterday, it was planned and we made it! and we were trying to put the past years into words and then I saw your post today, I hope you and your DH get a wonderful lunch soon