I'm so sorry Expat, for Ailidh and for all of you. I am sending you strength, love and healing vibes.
I haven't been in your position exactly, but I know how you feel about the night time obs. Every couple of hours they disturb your darling dc. They and you get no peace. You just want everyone to fuck off and leave them alone.
I know the guilt of wondering if the right decision has been made. Your mind goes round and round. It is exhausting.
Hindsight is a wonderful thing, but really you can only make your decisions with the information you are given at the time. Whilst it was you who signed on the dotted line, if the Doc's weren't in agreement then it wouldn't have gone ahead. You think that you have the final decision over your child's care, but if the Doctors don't agree with you, they are able to overrule you. I think what I am trying to say is, it probably wasn't your choice alone.
Like your rock climbing 'moment', I had an epiphany too. It felt liberating and gave me a clear mind.
Looking after a sick child is exhausting, frustrating and boring, and by God you feel awful for feeling like that - especially as your dc has all of those things going on as well as being ill.
You are all in my thoughts x