I haven't I guess since earlier last year, but I think about it every day and what it would feel like and where I would do it... It's hard if it helped you cope with things and you are still feeling those things and have no outlet. I really only stopped because it wasn't enough and was afraid I would keep going, not even knowing what I was doing anymore, really.
And I did it before I was even depressed, to deal with my extreme anxiety...so there are lots of reasons people do it and I guess it's not all for one clear reason even for one person.
And it's hard if you aren't getting enough support from your wife...I don't think people who aren't depressed can truly understand it. I hope the two of you can get back into therapy together.
(So if I said something totally off base, please ignore it as I only skimmed the previous posts). I do wish you the best of luck. Keep finding other ways to get your feelings out...you've made it 8 years!