Regardless of the question whether it's considered depression or not,it does sound you don't feel completely right. Has something happend lately? Have you tried to talk to someone around you?
If you feel there's no one you can talk to, or you feel like you need a mre professional help, you can try to talk to people at the support line (details here:
http://www.dbsalliance.org/site/PageServer?pagename=...)
Take care,