I just went through a period of the worst depression I have ever had.  It was not like the normal depression I feel where I am tired, low energy and generally have no emotions and feel numb.  This was much worse, I felt extremely anxious, I didn't eat a meal in 5 days, only could manage some fruit and I barely slept.  My mind was racing constantly and I had to get out and walk for hours.  I couldn't get the thoughts to leave me alone.  Some days I came home and cried for hours and couldn't stop.  I thought my life was over and it is also the first time I have self-harmed which I hope I never do again.  

Today, I suddenly feel really good, I am smiling and talking to people, I feel like there's a lot to look forward to.  I feel like going out dancing.  I don't understand what's going on.  Have had mood swings before but not this bad.  I don't think it's bipolar because I don't think mania matches my behaviour in the past.  I'm not complaining about the good mood, I wish I felt this way all the time.  Does anyone else get these mood swings after a bad depressive episode?