The first thing you are doing wrong is being dishonest with your wife. Pick up some of Dr. Harley's material and read it - Love Busters and His Needs, Her Needs.
Your wife needs to also be able to come to you honestly with money matters. I don't know why she is lying but that is killing your trust for her. And that is why you're having such problems with all that happened before you two got married.
Dishonesty between the two of you set aside, you are definetly depressed. You have all the symptoms. Maybe if you look at the situation from a different standpoint you would be able to go get some help. I know the way you're looking at it now will only get you into more trouble. A man's pride is actually a statement of just how insecure he is. He uses the "I'm too big to go get help" to cover up the insecure little boy inside that says, "I'm scared that if I ask for help somebody will think I'm not really a man".
Now the way you can retrain your thinking that will help you get help is say to yourself, "I'm proud enough of what I have that I'm man enough to stand up and do whatever it takes to save it all, even if it means I have to get somebody to 'teach me how this new machinery works'".
In other words, remember that once upon a time you had to learn how to walk, then to talk, then to ride a bike, then to drive a truck, or maybe a tractor. All you are doing is getting somebody to teach you how to work on that vehicle. Even if you were a mechanic, there was a time when you had to learn how the thing was put together.
Go to the doctor and tell him the symptoms you told on this site. Sleeping, irritable, not motivated to do things you enjoy; and he can give you some medicine. Take care of that first. Then sit down and write out what it is you feel so you have time to recheck thing and make sure it's all there, then go to your wife with it. You can't have a successful marriage without honesty.
Good Luck!