a blucky mood

Every few months I get this funk. I am annoyed at everyone (or at least it seems that way). I don't want to do anything (but I don't want to do nothing either). It's just this blucky annoyed sick kind of feeling. I don't like it. I don't invite it, it just comes. And when it comes I have to get out of my house that has 500 people in it all the time; away from cute couples and schoolwork and such. I wish that I understood this feeling and I wish that I could get rid of it!!