It's been happening to me a lot lately. I have to admit that I don't understand the reasons why.
I don't experience anger, though. Just an abundance of extreme sorrow and sadness, then without warning bounce back to feeling fine again.

I'm not on any meds or have been dx'd with anything, (although I'm beginning to wonder if I should get myself down to clinic to see what really is going on with me, anymore), so I can't exactly contribute these emo swings to the effects of meds.
However, it's very likely that I'm beginning to experience hormonal changes...I guess....won't know til I get self down to find out.

From what I understand, depending on if you're on medications, have changed to new, your dx, and your age...all can contribute to the confusions of the emotions you're experiencing.

I hope all works out for you, and you don't have to go through the extremes for long.

Shangrala