David, I'm probably overstepping myself here, but do you have someone to talk to about these feelings? Can you talk to SWMBO? This is really none of my business, but I have often noticed that spouses can be difficult to share certain feelings with. It seems to me that men often have good friends for watching sports or drinking beer, but can't really talk to them.
I'm female, but in my real life I have a lot problems sharing problems and thoughts that can be perceived as negative with my friends, so I can relate to this sort of thing.