I'm also PTSD, Major Depression, Borderline PD. I've gone through "talk therapy" and if you find the right therapist, it can make a huge difference. Have you tried therapy? Is it available to you? I am also on anti depressants. I hope you are too. If not, get on some, quick! Depression is nothing to be ignored!

There is also a book that I found helpful. But like anything, books don't work for everyone. I found this book at exactly the right time in my life and it helped change my perspective.

I know its hard when you're depressed, but if it happens to you everyday, there is an element of "habit" involved. Try changing your routine. If you sit around your empty house and miss him, maybe instead, you could take a walk, or drive to the park, take that time to work on a hobby (do you paint? draw? crochet? anything you want to try to do?).

Good luck. And remember Life is not a road, but a journey.