Just remember she's an alien right now. When my DH had his EA, I could not believe he didn't remember being so deeply, passionately in love with me. But he didn't, totally rewrote our history. He's doing that again now, second guessing his reasons for being with me. In our case, he just got off the roller coaster for a few years to repair it and make it even scarier.
Those chemicals going through her brain are changing the way she thinks, acts, and remembers. It's not her, it's a crazy, caricature of her. The woman you love is in there, she's just hiding right now. Sort of like one of those awful B horror movies where someone gets possessed and the priest comes in and says to the demon - let me talk to Rachel, I know Rachel is in there - and suddenly the demon voice disappears and Rachel's small, timid voice comes out - help me, father, help me. Every once in a while, your W may pop out, but then the demon takes control again and it's rage and anger and lies. Keep your sanity. Treat her like you would a woman possessed, as she is, by the spirit of deceitfulness and lies.