Sorry to hear your H is in a down cycle again. I'm not familiar with Rivotril - is that an antidepressant? (Names are often different in different countries). Some antidepressants will depress the libido - but then, depression itself will do that also. Does your H seem depressed in other ways? (ie mad at people at work, impatient, poor sleep, not enjoying things he usually would enjoy?).
Sounds like you are doing a pretty good job of taking care of yourself (good for you with your running ). I know it is hard living with a depressed person, but the more you can Act As If and be upbeat and happy, the better. It really doesn't help their depression if they can see they are making you miserable too.
