I honestly think that listening to those around you is a good way to gauge a mood. We don't see ourselves in the same light as those around us. Hell, half the time we are in denial that anything is going on. I think that it would be wise to consider what your wife is saying, and I say that as someone who's wife tells me the same things when my moods are off. From personal experience, my wife has always been able to tell much better than me when my moods are fluctuating.