One thing I notice that distinguishes my symptoms (ADD) from Bipolar is that my moods worsen ONLY when I'm overwhelmed, stressed or going through changes. For example - the other month, I had a lot on at work, I had a huge assignment due and my apartment was in the process of renovation...I knew I'd end up having a small fit at the end. I get the same way when I have to organise something big or any time when I'm juggling too many tasks.

My friend has bi-polar and she's quite the opposite - she's very organised and loves being busy but her moods change for no real reason - she might have a super productive week where she's energetic and can literally accomplish anything...then she's sad and crying for the next few weeks.