Make sure she knows how you feel. And that she knows she is important to you and your sons. It sounds as though she is in the depressed end of the spectrum and may need a med adjustment. Be sure to contact her pdoc about ANY changes in her behavior. It is often easier to manage a depression before it is full blown and she can't even move off the bed. Often in the pit of depression we don't realize how ill we are, and need someone to tell us.
It's wonderful that you are standing by her through all this. I know how badly this can affect a family. The person suffering with the disorder certainly isn't the only one suffering. This illness takes entire familys down with the afflicted. Hang in there. You'll be in my thoughts and prayers.