The newborn stage the first time round is completely brutal. I was a wreck on the verge of a nervous breakdown for the first 12 weeks of DS1’s life.
I think you need some counselling about why formula feeding is making you feel so bad. I know you’ve posted previously about it. If you can learn to ‘forgive’ yourself for formula feeding you can then pack in pumping which, in the newborn stage, I certainly found to be a time consuming nightmare.
DS2 (nearly 9 weeks) is an average to low crying baby id say. Days with him are tiring and unpredictable but pretty manageable. DS1 cried for hours and hours on end and I can safely say the difference in experience is night and day between the two (despite DS1 actually being the better sleeper as a newborn). So don’t downplay how much having an unsettled, colicky baby affects your experience. The vast majority of times newborns cry because that’s what they do. IT GETS BETTER AND RELATIVELY QUICKLY IN THE OVERALL SCHEME OF THINGS. But the usual caveat that if it’s regular and he’s inconsolable and especially if you notice any other symptoms you should see the GP.
And of course it’s normal to grieve for your old life. Imagine any other situation suddenly pulling you out of your routine of work, socialising, exercise, hobbies…then forcing you to undergo major surgery…then subjecting you to severe sleep deprivation…then forcing you to spend 24/7 with an entirely new human…with huge hormonal shifts to boot. Would we really tell people to #enjoyeverymoment then? Of course we wouldn’t. It’s a process and there is not set time for how long accepting, then enjoying your new life will take.
I don’t feel there is much point telling you it will get better at 3 months or 6 months because that will feel like an eternity away now and it might not be true for you. So instead just keep ticking off the minutes and the hours, carry on the sertraline (? Does your dose need to go up), grab any offers of help you get and try to make peace with formula feeding. Good luck.