Maternityleave,
It is crucial you and your dh go to marital therapy. He needs to understand that he is prioritizing the wrong person. Is he open to it?
As for your ILs puffing, screaming, tantruming, faking ER visits, etc. It is part of the game.
What you need is a timeout from them, to difuse the situation and prevent escalating that will burn the bridges. Is it possible for you and baby to take a break from them? It is like a scab, the more you see them, the less you heal and the more it becomes infected.
You are not responsible for ILs' and dh's hurt feelings. They do that to themselves with their unrealistic expectations
Do you communicate with your ILs? If so, stop the social secretary role. Your dh is their new point of contact, for weekend plans, holidays, text messages, everything.
Tell your daycare provider that your ILs are NOT allowed to pick up or visit your child in their facilities. If that happens, they must call you.
Would you be open to move?
Ask yourself, how much longer can you handle this weekly visits to the ILs? Ideally, what frequency and duration would you be happy with?
No need to answer, these are just questions to retake control of your life.
Your ILs need consequences for their entitlement. If they complain they are not happy with the weekly visit, reduce it in half (twice a month vs 4 times a month).
They complain again - make it once a month
If they are passive aggressive with you during the visit? Give them one warning they are to stop it. If they do it one more time, you leave their house with the baby and see them again in 3 months
Actions with consequences will hopefully reshape your relationship.
Finally, only mentally healthy and reasonable relatives are important have in your child's life.
A child can be very happy growing up without his/her grandparents.