Yeah I get like this too! I am "seizure free" for the most part but I go into depressive states and suddenly switch over to rational thinking as you described. It is extremely lonely I feel you there

I’m not a specialist, but I have a theory. When a seizure gets triggerd , the seizure waves could be hitting the part of the brain that causes those emotions to act up.

Don't worry, I go through the same thing. I tried counselors and people to talk to just in case I was depressed, but I'm always happy until I have these outbursts. You're not alone. Don't worry.

Bipolar is longer lasting. This is literally for minutes. Then I am my happy self again.

I get this quite abit i thought it was my medication side effects. its like an outburst of uncontrolled emotions it kinda feels like im bipolar