I am so, so sorry for the loss of your precious girl, what is your sweet girl's name? It sounds like you did all you could for your precious loved one to help her and give her comfort. You gave your precious baby the last loving gift you could ever give her, you didn't let her suffer, you put her needs ahead of your own, such an admirable and yet gut wrenching decision to be made, I can only imagine the difficulty of such a decision.
I don't usually give advice on here, but I wonder if you shouldn't read the results of the endoscopic biopsy, at least just not yet, put the report aside until a later time when you aren't in such pain, give your shattered heart some time to mend, and your mind time to process all that has happened. That report will always be there for if and when you decide to read it, adding the possibility of extra pain isn't going to do you any good right now, of course I completely understand the "wanting to know", but maybe wait until your heart isn't so broken.
I am so truly sorry for your loss, if you feel up to it, I would love to hear more about your sweet girl, of course I understand if you aren't feeling up to it at this time, whenever you are ready, there is no rush.
Sending peace, strength and healing your way. May your heart always know and feel the love and light that is your precious girl.
Sincerely, Don & Vera