If this helps, if something like this hasn't already been said:
It is possible to distinguish the cessation of perception & feeling by distinguishing what it is not. It is not the jhana of nothingness, nor is it the jhana of neither-perception-nor-non-perception. Think about what exactly that means.
Nibbana is when the mind is no longer coming or going, but that does not mean it's frozen. Because it is the greatest form of freedom. In whatever we might conceive as "nothingness," there is no freedom. And in whatever we might imagine to be a "mystical transcendental state", there is coming and going. And in both states, there is craving, rebirth, and suffering, even if incredibly subtle.
The best things in life aren't things.