Dont suffer. If you can afford it 100% get a nanny in.
You might be able to find a Childminder’s who does after school who would be happy to add a few more hours to their earnings to have him or a nanny who has school age children or works part time who would be happy for an extra few paid hours a day. Other than than go the whole hog and get a nanny full time if you are able.
Don’t wait for family to offer to help. I had very minimal help, if I can even call it that from my own mother, she appeared a few weeks after each child’s birth to have the obligatory granny photo taken and then promptly ignored them and us and visited a handful of times in a decade. Once in the early days of child2 I called once I was officially diagnosed with PND and her reply was “Been there, done that, got the T-shirt” when I put the phone down she rang back and left a message on my answerphone telling me never to be so rude to her again.
Funnily enough that was my last real contact with her as my mother.
So in the harsh reality of life you chose to have your family and now you and your dh are responsible for the upbringing. If he is unable to provide emotional and practical help as my DH was either incapable or unwilling to do then you need to throw some money at it.
Not just the childcare, your health too.
I got through by eating foods and drinks without sugar, caffeine or additives. It stopped the spike in stimulus that affected my mood and in turn mind.
I also had cranial osteopathy, later on discovered Reflexology which had been a god send and discovered meditation. If you are unable to get to a class try downloading Insight Timer mediation app and listen to it. It helps.
Above all give priority to you. There aren’t no prizes for battling through, equally there is no right to expect people to provide childcare in the family. Find the right care for you both and sort it long term for a happier you