Hey how are you doing, and welcome.
Listen I am not married and I cant give you any advice about telling your wife (I do know the white book mentions extreme caution, and I don't think a decision out of despair is a good one), but I can tell you this, telling someone helps, isolation is our worst enemy. If you don't have anybody yet, then pray for somebody, or for the guts to actually be honest with a friend. I have a great friend who was open with me but I was never able to be open with him, but when I decided that it was time I felt like the world was going to come crashing down and the feelings of shame would overwhelm me and that I would never be able to look him in the eyes again. Well, he accepted it pretty nonchalantly, were still best friends and boy did it feel good.
But I digress, KEEP POSTING, it helps with the isolation, ALOT. the truth is no matter what, even if you do open up to somebody who is not a fellow addict, then you wont be sharing the ins and outs of your every day struggle, ( in my opinion) its not healthy for your relationship and they wont really understand. This is a place where you can do that a little more freely and there are some people here who can give you some pretty solid advice and encouragement.
Listen, as to whether you are an addict or not, for me I found clearing up that point was and is crucial. Because until you can define addiction you cant accept it, and if you cant accept it then you cannot begin to deal with it. Reading the white book of SA might help (let me know if you want a PDF version, I got one from our friend gibbor120).
Oh, and by the way Kol Hakavod, 42 days is something to be proud of, keep on going.