I'm always pretty aware of when a sudden mood change is about to come on because for me it almost feels as if it's an impending doom. Literally feels as if a black cloud follows me. I can be in a great mood - sometimes for a day, sometimes a few days. If I'm lucky, a whole week! Things that would normally trigger me, don't.  And then suddenly everything changes and I feel hopeless and lost and scared and I hate myself and everyone around me. And I just want to fucking die.