This is normal, and there's no way to avoid it. It happens to all of us. The trick is to not allow it to draw you off your DB track. Stick to your plan, and be the man she would be foolish to leave. Remember: These things take time to turn around. Dig down deep for patience.
I agree it sounds like you are doing well Grizz. Hang in there buddy!
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl