I'm sorry you're going through this; flipping around from one intense mood to the another must be exhausting and just plain horrific.

I am going to dissent here, though, and say that mood swings that last so short a period of time is not common. Not that it doesn't happen, it's just not common. Some would say it's rapid cycling, but then that's having around 4 episodes a year.

I would look into if there are any triggers for at least some of your moods. You could be experiencing a combination of a bipolar mood, along with changing moods based on environmental triggers. If these exist, at least you would have some control over how to respond to the triggers, especially if you've practiced coping mechanisms in therapy, rather than necessarily having to up meds. Or maybe you'll need a combination of upping meds and using coping mechanisms, who knows. Either way, I hope you feel better soon.