How is EMPTINESS different from NOTHINGNESS?
Ken said it pretty well. "Empty" has a negative connotation, implying there could be something positive. It may well be said, but on the bright side, it could be filled! There is hope! With nothingness, you're on a neutral ground. You can't get anything positive because positive doesn't exist. Neither does negative. Not sure if I'm following your question correctly...
Emptiness is common, nothingness is impossible.
Emptiness has space..... nothingness can have no space either.
Yes. You are right. When you feel some vacuum in the head, the mind will not function effectively. It is difficult to think or decide either this way or that way. It thus leads to some sort of confusion in the mind.
My stomach is empty but my mind is literally wrapped in nothing.
It isn't. It's simply two terms that describe the same thing. It's like asking the difference between "sleep" and "not awake".
To me, "emptiness" implies there could be "not empty". "Nothingness" to me has no alternative.