We all have down times, but I think if you would get a more positive outlook on your R that you would believe in it. In the DR book it talks about this. "ACT AS IF", act as if you and your H will eventually be happy together, after awhile you will believe.
I must tell you that is my secret to how things have been going better in my sitch. I "act as if" H is only temporarily gone and that he will be coming home. It's working for me. Just taking one step at a time. I started saying~we and our, more. And now I'm acting as if we will be doing things in the future. It has a lot to do with your state of mind!
Try it, one step at a time. And quit putting up the walls! When you put up the walls YOU can't go anywhere!