Twinkerbell, how horrible for you. I'm a depressive and even I can't stand living with me when I'm on a down!!
This might be a bit long - it's partly for DH, as I empathise, and partly for you as I've got a story to tell you.
From the POV of someone with this life-sucking condition, I'd like to tell your DH that it is worth going back to the doctor's. I know how hard it is: you feel like there's no point anyway. Everything makes you tired in your bones, the doctor doesn't care, the meds don't work and who the hell wants to say "I've got a mental illness"??!
Anti-depressants work. But they take AT LEAST six weeks to start working, and most people have to try a few different ones before they find the one (or the right combination) for them personally. I had to try six different assortments, but I was in such a state it was an effort not to top myself every day.
It's worth it because it's so great when the sun comes back out. Getting up in the morning, without immediately thinking how crap everything is, is a blessed relief. And when you get back to mornings you can actually enjoy; when things make you smile just because, and small problems are small again: life feels just that much easier & pleasanter
Some doctors are about as clued-up on depression as some of Twinks's respondents above. This isn't helpful. If yours is a pull-yourself-together merchant, you may have to claim you feel suicidal (the term is "suicidal ideation", which means you make plans as to how you could kill yourself). If your doctor's better than that but you hate admitting how rubbish you feel, write it all down - I mean, the very worst, negative parts - and take it with you. I had to do that, as I kept going in and saying "Oh, I'm okay really". Rolls eyes at self.
Twinkerbell, I've been 'talking' to man on another forum whose wife left him. It turns out she had some worrying issues of her own, but that's not my point. He identified his depression as the reason why she left him - went to the doctor, started taking better care of himself, and is an absolute joy to hear from these days. Anyone would be glad to marry him! Here's his thread: Wedgewood on 2-in-2-1
Sending you both my very best