I know exactly what you are feeling. It is hard and sad. And a whole bunch of other stuff. The day I got a book that wasn't related to M, MLC, Depression, was like I got my life back. Very strange, but once I took the step to do nothing but enjoy, I have found it is easier to actually enjoy. I have finally even caught up on all my shows on the TIVO.
Good days and bad days are to be expected, but you just keep plugging. And reading a steamy romance or even someting you always wanted to learn about while under the covers eating popcorn is still GAL.
If you focus on the past, you ruin the future. You can only live for today.