Today is a day to feel a sense of accomplishment.
Take five minutes to make a list of things you are going to do today. Put things on there that are obviously. Like "go to the bathroom." Put it on there several times. Put your meals on there -- not just preparing them, but eating them. Every little thing you do should go on the list.
Then spend the day crossing them off the list. It will feel SO good to get so much done. And you may realize that even on days when you don't feel like you've done much, you actually have accomplished a lot!