I also have been like that in general for a few weeks or so. Just sort of sad, with anxiety, and not getting much done. I thought it was the winter weather. I'm not sure if it's winter where you are, but this could also be a possibility.
You may have gotten to the point where you've resigned yourself to the fact that it's not going to work, and are beginning to grieve about it. Do you know the five stages of grief? You can google them and see if your feelings fit into any of those categories right now. (((hugs)))