I have been depressed on and off since I was 13 years old (I am now 30.) Lately I realized though, I have a lot of mood swings...I can go from being very cheerful and energetic, to feeling hopeless and depressed. I am not bipolar though because I don't have most of the symptoms of mania or hypomania, apart from having a lot of energy and being really happy. I am really confused though because sometimes I feel I need to take antidepressants, but then the next day I feel fine and don't need to take them.

Anyone else experienced this and is it normal with depression? Or is it something else?