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blackpearl
I do understand she is tired with two kids under 3 and her husband not really helping but friendship goes both ways.
Not with breeders it doesn't. A friendship with a parent typically is a one way street where you do all the giving and they do all the taking. This is why it's often very difficult to stay friends with parents, especially when you're childfree because then they assume you have all the time and money in the world to devote to them.
In any case, I'm sorry to hear your friend still sucks. It really doesn't sound like a friendship that's worth keeping, to be honest, not only because of this most recent behavior, but just how they've been treating you during past visits. Her being tired from having two kids she didn't need to have in semi-rapid succession doesn't give her an excuse to treat you like a pack mule/punching bag.
And yeah no, endo isn't curable, and the ones she claims cured theirs most likely never had it to begin with. They probably just had fucked up periods, used Google to diagnose themselves, took some bullshit snake oil remedy and got "cured" through a placebo effect.
If you don't have to associate with these people, it sounds like it might be best to just not bother with them. The way both of them treat you isn't how friends should treat one another.