BlackRing

Is it entirely possible to permanently lose some of that memory after a serious bout with clinically diagnosed depression?

Have you ever had something akin to an MRI? If so, what if anything was noted as out of the ordinary?

Please do. Please see a physician. What you're describing sounds horrifying. I am no expert or professional, but as far as the zoning out part, it sounds like a seizure. Not all seizures result in flopping on the ground and puking...