What gets me most is how H can show me glimpses of his old self on some days and then, without notice, shift right back into his angry alien mode.
YES!!!! My XW would slip into her old self now and then, it gave me hope that she was trying to fight her way back out past the alien. But over time I saw the "old her" less and less until she completely vanished. It was maybe 3 years post-D before I started seeing glimpses of the old her again. She came back little-by-little, but never completely (at least not yet?) I'd say she's about 50% of her old self now.