Thank you for clarifying 
When I mentioned hollowness, I didn’t mean nihilism. I’m not sure I’ll be able to fully explain, what I meant.
I guess it’s a sense of deflation or perhaps disappointment or even a sense of ‘why did I even think that, that was a good idea to do or pursue’. Or even ‘that was a total waste of time’.
I guess I used the word ‘hollowness’ because there was another thread here recently, where I participated and we spoke of the ‘hollowness’ of worldly things/pursuits, as in the famous Lump of foam sutta. So more of a sense of emptiness (hollowness), rather than ‘nihilism’.