I've had some similar experiences myself and all I can say is that when I resisted the experience, not only did I suffer, (lol...and wonder if I was going nutty!).... but my resistance ensured that I remained 'stuck' in that perspective...however, when I completely accepted my experience (stopped entertaining negative perspectives about it)...it evolved and actually transformed.....I moved from feeling 'empty' and devoid of anything to experiencing the profound peacefulness of the silent witness...in my estimation,it's really all just about making a minor shift in perspective.
I hope to go the next stage to experience more joy and happiness but I am not there yet, I am certainty "in the moment" almost all the time and my mind is silent but I am stuck in the emptiness phase I have also realized most the feelings I had were part of my mind/ego I guess died (ego death) so therefore I don't experience emotions as much as before.
So how did you evolve from the emptiness phase and feel more of the higher emotions like joy and happiness etc. I do think I am nearly there.