YESSS! I used to put it as if there are two separate "self", one depressed, and one "sane", and the two alternate without communicating. When I'm depresed, like now, I can't imagine how I could feel good... when I'll be OK again (I know it will happen from experience, but I don't really emotionally believe it right now) I will forget HOW really bad I was.

Just how it works

However, your rapid swings seem to deserve attention from your pdoc. Is there a mood stablizer in your medication cocktail?