I love vulnerable!Harry, especially when he's so determined to get himself out of his misery, even though he really can't. And Snape is appropriately brusque, yet his care shows through in his small gestures, the master of subtlety that he is.
I've always loved the way your stories take the accepted interpretation of canon and twist it around, giving us an equally plausible explanation of Harry's headache when he first (re-)laid eyes on Snape at Hogwarts. Lovely!