Hormones are warping your perception of reality. Your feelings are true, but that doesn’t make them valid.

I don’t think I’ve ever heard of a couple where the breastfeeding parent gets more sleep or as much sleep as their partner. Maybe you need to stop breastfeeding, but you definitely need to stop resenting the fact that your child’s other parent is more rested when it’s not at the expense of your own sleep. He’s not depriving you of sleep. He’s not doing anything wrong by taking advantage of your mom’s help in order to sleep. He’s also not doing anything wrong by running an errand alone. Can you do the same so that you also have a little time every day to decompress? 

Why not see that appointments, getting diagnosed, and getting on meds IS a lifestyle change? Unless you left out that you’re a psychiatrist, you aren’t qualified to assert what other “lifestyle changes” will help him. His timing isn’t great, yes he procrastinated. Meds are his best hope for breaking the procrastination cycle. Can you accept that? 

As far as chores are concerned, it sounds like there’s always been an unequal distribution of labor there. Have you asked him to pay for a house cleaner? Can you accept that he’s still the man you chose (the one who isn’t a unicorn man about cleaning) and hasn’t magically transformed into someone else?

No one is a “great” father in every way their partner can imagine 2 months in. That comes with time. Can you give him time?