Sounds like a lot of sleeping. I agree about couples counseling. If something else is troubling her, she'd need skills to express that in an appropriate manner. And you'd need skills to safely and effectively express in the moment. And both could learn the art of active listening .
If the anti anxiety at that dose, didn't help, then perhaps address with your pdoc? Could be underlying depression. What sometimes feels like anxiety is dread and it's a depression symptom.