If it's written with the same style of his I Claudius books I'd read anything of Graves'. I think I'm most interested in whether he explains how he felt about the war before he went and then after - I'm wondering if most of the bitterness is post-injury or was there all along.
Have you read The Beauty and the Sorrow by Peter Englund? It has WWI experiences, and sent me off reading some of the books that were his sources. I know there was at least one nurse in Englund's compilation of memories, but Laura De Gozdawa Turczynowicz's book When the Prussians Came to Poland: The Experiences of an American Woman During the German Invasion (1916) was my favorite follow up book.
Those are both going on my list! Especially the one on Poland, because that's a perspective I've not read about. I have been hunting through some of my bookshelves still trying to figure out where I heard about Borden - no luck so far.
I think you'd love both books, to say they're eye-opening and very moving is an understatement. After reading Englund's book I found When the Prussians Came to Poland free on the Google Books site. Like you I'm too often losing track of where I heard of books or people--I had to hunt around on my GoodReads shelves to find the name of Englund's book.