OLC, understand your triggers, you clearly - like me - get worse at night.
Some depressives wake up full of doom, I woke up hopeful, but that ebbed and slid away to despair in the the wee small hours.
You are not YOU at the moment, YOU is not calling the shots, depression is. Try to slow down, really think about what you are feeling and if there is any real tangible reason for that feeling. If not, tell yourself that is the depression feeling it, not you.
Your H, if he's never been there, will not understand. FWIW, it sounds like he's just trying to get through this, to do whatever it takes but he's as lost as you are.
It's OK, inform yourself, so you understand what is happening to your body, and tell him about it, he may be able to understand you better then.