You've certainly made a good decision posting here for help. I understand the feelings you have, as I have had similar ones at points in my life. I know its hard to take this advice seriously sometimes, but you have to know your feelings will go away eventually. We all have our bad stretches and our good stretches, and you just happen to be in one of the bad ones. From what you said it seems like you are in one of those moods where you can't see the positive in anything. I advise that you just take it easy for a while. Trying hard to find enjoyment would probably make things worse. I wouldn't suggest you stay alone all day though, because that could obviously be volatile, so chill with a family member or a close friend. They know what you're going through and would be willing to offer their help.
If you have any concerns, let them out. Keeping them in might seem easy and right, but it really isn't. We're all here to help you through this tough time.