What symptoms in particular do you think mark your depression as atypical? Is it this one?

"The main characteristic of atypical depression that distinguishes it from melancholic depression is mood reactivity. In other words, the person with atypical depression will see his or her mood improve if something positive happens. In melancholic depression, positive changes will seldom bring on a change in mood."

I copied that from an article on WebMD.

I have found that when my antidepressant stops working, my depression becomes atypical in the sense that I have the mood reactivity listed above.

My diagnosis is MDD (major depressive disorder), though. If I am not taking an antidepressant, my mood will become unresponsive to positive changes.

I just read another article that lists a whole list of other symptoms that it says are common with atypical depression. I have never felt that I understood clearly what atypical depression was, and this is why. The sources I see conflict. Very confusing!