OP, you will begin to feel better. I could have written some of your post, it’s like reading about my own life with my first DC. I am better now, and you will get through this.
I had both my DC prematurely - 32 and 33 weeks.
DC 1 - NICU for 3 weeks. We could never get breastfeeding to work, so I exclusively pumped for about 7 months. It is probably my biggest accomplishment as it was the hardest thing I have ever done. Waking up to pump when baby slept, then waking again with the baby. Cleaning all the expressing equipment, and bottles, which luckily DH did. Nightmare. I became obsessive about keeping on expressing, and I really should have stopped earlier. I think I felt guilty that DC was born prematurely, I blamed myself about not carrying till term, so then I felt like I had to provide breastmilk at least, otherwise I was letting DC down again. This of course isn’t true at all, I was a great Mum, but I didn’t feel it. Then when I finally did stop, PND really hit. I felt like a failure and I spiralled down. I felt empty - I couldn’t come up with happy memories when asked in therapy. Unbelievable to look back on, but it’s how I felt. I remember thinking, if I really feel bad, I could walk out in the sea at least. I got panic attacks, massive health anxiety, and really was very unwell.
DC2 - pumped for about 2.5 months. I was able to see how pumping was affecting me again - I now had a baby, another child, and had to try and pump. I couldn’t manage it all, and made the positive step to stop expressing at that time. Moved to formula. This time I could see that I wasn’t failing my DC, and I didn’t get PND. Formula was absolutely the right decision for me.
I regret expressing for so long with DC1, I should have stopped earlier as it had such a negative effect on my life. When you’re in the middle of it, expressing/formula feeding feels like the most vital decision ever. But actually, our own mental health is so important, more so than whether it’s breast milk or formula. We want to enjoy our baby, and if expressing means no sleep and struggling every day, something has to change.
Sending best wishes and hope you feel much better really soon 💗