My apologies for not having read the full thread. I got about 2/3rd of the way through and just couldn't shake off the following:
FFS woman , you could have died and lost your children. You didn't. This should be the cause for the greatest celebration, not a joyless raking over the minutiae of the whys and wherefores. You were unconscious- you woke and your MIL hugged you? It's fine not to like it, it's fine to speak to your husband about it for future reference.
If your MIL was the only one showing emotion and your husband wasn't - that's odd. If your MIL was batting him away and refusing to let him near you- that's odd. But it doesn't sound like this was the case.
Sometimes life just doesn't work out the way we planned it and you know what? That's fine. Things to go shit all the time, but the knack is in being able to see the bigger picture. You are well. Your children are well. Your husband is fine. They all love you.
Loads of stuff doesn't go to plan sometimes- Hospital staff have a thousand other things to do than staking out your room to make sure that certain people are in there at certain times. You had a family member with you- one who has close ties to you and your husband. You don't like her - that much is clear.
That's fine, you can deal with that at another time. You can speak to your husband about boundaries. Hell, go no contact if it makes you feel better. Get counselling, talk it through with someone else. Talk to your husband about managing other people's expectations about your reactions so you won't be freaked out by this sort of thing in the future.
But please try and accept that no one acted maliciously. There is a huge difference between thoughtlessness born out of worry and anxiety and active ill will.