Im bipolar n have really struggled w this as well since 2001. Feel like always going from super depressed for months into being super manic w just a weird few weeks between. The last 4 or 5 months have been the most "normal" moods have been. Alotttt of bad n crazy stuff happened n i actually handled it pretty well considering......until few days ago, depression hit me like a ton of bricks!!! I understand your question though, after awhile you kinda forget what normal expected emotions are like. Hang in there!