foremost, i commend you for listening to yourself and getting the help that you needed, because at that moment, you did need it. whatever came after as a result of that (that may have been unnecessary such as the placenta questions), are what come with that help that you needed initially.
now, to another point that i think is important about manifesting and so on. my husband and i are exploring the workings of Ho'oponopono. this hawaiian system focuses on *taking responsibility for everything* so it fits in nicely with UC, i think.

another aspect of it is that there are many unknowns, and that to an extent we have to "surrender" or "accept" that there are unknowns.
to me, this plays out in your birth story in this way.
in the first part, you said you had this feeling, and you needed help, and you got help. all of that is great, taking responsibility, acting rightly in the moment, etc.
what you didn't know in that moment was that you were dehydrated. had you known this, you might have said "ah, i'm dehydrated, let me try to hydrate first and see what happens." and, you might have tried and failed, and needed help again (the IV), and called for help and gotten it, but you would have had another option based on what you knew.
but you didn't know that at the time. what you knew is that you needed help, and you got that help, and that was the right thing.
now, taking a step further out to the idea of resposibility, even if you didn't know, there is a certain aspect of ho'oponopono that i find difficult, and that's taking responsibility for whate happens, even when you don't know something. ACK! what?

seriously, it's hard, right? you have to take responsibility even for what you don't know, because it is what happened, and the only way to move forward is to take responsibility.
so you can take a step back and say, "i am responsible for having become so dehydrated that i needed help." with that, you can have gratitude "i am so thankful that help was available to me. because, that IS something to be grateful for.
now, another aspect of your becoming dehydrated you mention--new altitude, two wood burning stoves (which dry you out like crazy. can i make a recommendation about those? if they have a wide top, you might check out LL Bean's stovetop humidifiers in cast iron. they are pretty and decorative, and you put in however much water (and in my case, tea or herbs cuz i like the smell), and then it helps humidify the roo! the cheap version is to just put a pot of water up there), and then also the water birth and whatever impact that might have had.
so there are unknowns there, things you didn't know or expect, that lead to the dehydration. and maybe there were other things like not knowing or remembering what to drink and when to drink it (eg, roobois chai is a perfect electrolyte balancer and also rehydrating drink without sugar or salt like gatoraide; emergen-C is also a good option, etc).
so you can take responsibility for not knowing those things, and go "ok, that's what lead me to that problem."
this is not about *blame*. this is about processing and explaining and taking responsibility for it.
now, because there were things you didn't know, other things happened. even if you had known about dehydration, something else that you didn't know could have created a curve ball for you.
either way. . .*you succeeded*. you may not have manifested the "perfect UC" but you did manifest a *great* birth and also an *instructional* birth. I don't know what those instructional elements are, but they are there. heck, i did have a perfect UC and there are A LOT o fthings that i'm processing, taking responsibility for, and there were curve balls (well, mostly after) that were surprising and informative.
but using ho'oponopono as well as other LOA information, i'm able to process them, to look at what i didn't know and take responsibility for it and then learn and move forward.
you did great, really, you did everything exactly right.