I have those days too. For now I wait them out and I usually find the strength to keep going. At some point these feelings may not go away. Maybe that is when it is time to move on. I figure no one can do this without feeling overwhelmed at times, so a few off days or even a few weeks is normal.
We get to see a whole new, and not-so-pretty side to the ones we love. We have to look and see if the relationship is "worth it," all without any positive feedback from our spouse. In a way, it seems to me that this is a more honest way to look at your spouse than the rush of romance. You get to see them, warts and all. Then you have to decide if you can or should stay in the R. Some things will never be fixed, but maybe by knowing the dangers that are there, we can find a path to a fully loving R again. Then again, maybe the R holds challenges we cannot or will not accept.
I left my first H because he was emotionally abusive, a compulsive liar, and I saw no hope that he would ever grow or change. In that relationship, I looked at him and at myself. I saw a man who's issues were way more than I caould handle. It was a matter of survival. I have never regretted that decision.