Maria,
this sounds like great news. Having a good day is a great sign. With my daughter, we were in a situation that sounds a lot like yours, where these precious moments of being almost back can pop up, but then it slips away.
For us, the recovery has not been a straight line. I know exactly what you mean when you say the hole that is very dark and deep. We have had some good periods, and we thought it was over, and then it went to again. But, the good periods keep happening, and I am sure it will happen with you. Just keep hanging on, it gets better.