Hey Rome,
Stop sitting around and get out and do something even if you have to force yourself. Sitting around all depressed is no way to spend the day. I know it is hard to get motivated when you are depressed but you can't go on sitting there just thinking thinking thinking. Even if you don't want to go out, pick up a book or something just to get your mind off using. Reading is a great way to walk into another world, even if it is only temporary. You may even consider reading books about addiction.
You know deep inside you can beat this thing. Using is not worth loosing!