Yeah, definitely talk to your psychologist. What you're describing sounds a lot like bipolar.

The abrupt and jarring mood swing is familiar to me. I've never been told my bipolar is rapid cycling, but it's a possibility.

There are lots of good meds out there. The balancing act most bipolars face is feeling more stable without feeling flat. Nobody wants to lose their highs, especially if they're non-destructive!

"Shock therapy" is pretty much a last resort these days, I think...many other things you can try first.