Oh god, I am 4.5 months postpartum but those early days are vivid Lou imprinted into my brain. The physical pain, hormones all over the place, mastitis (I had this too early on), exhaustion looking after now two kids, etc etc it's so overwhelming. My husband and I had no help (no grandparents-won't even go there on this thread!) so really felt hard at the beginning.
What helped me:
Spending £10 on this: www.beyondbirth.co/
OMG lifesaver. Really call, soothing support I'd listen to whenever the babies crying/exhaustion got too much
Trying to find humour in little things- ok this is hard, but as pp has mentioned laughing at the ridiculousness of it all helps sometimes
Going outside every day!! Even if it's raining or you can only hobble. Just get some vitamin d. I'd sit on a bench and watch our eldest scoot around whilst holding the baby. Felt slightly better for it every day.
Focus on each day at a time. Don't look too far into the future or at "the bigger picture" right now as it's not helpful when you're in the fourth trimester. Be present every day.
Find teeny tiny joys every days. Ie for me it was one cup of tea with two sugars (I never normally have this) and I bloody loved it. Treat yourself to little things.
Book your second child into childcare if /where possible. We did this with ours- boooed more after school clubs- he loved it and meant we actually got a slight, slight rest as a couple! (My husband would come home from work and we'd have like 30 minutes just us and the baby a few days a week).
I don't know your personal circumstances but hopefully you can do some of the above. Either way I hope you feel better soon. You're really in the thick of it now and v normal to feel anxious, teary and overwhelmed. It will get better ❤️🩹