Goodness, I do hope you husband will read more about clinical depression--or talk to an expert about it. As the other people are suggesting, are you seeing a doctor about it? You do need to start treatment. And remember that it can take up to a couple of weeks for an anti-depressant to really kick in, once you have started.

"Clinical depression" is a true, bona fide illness-- a physical illness. Do you have any "sick leave"? Like any other health problem, it will take time to get it under control, so you might need to take some time off from work. It's not something you can just "get over." People just can't "get over" pneumonia or diabetes, for example! Hang in there!