Messenger's Burden

I received a single-line message from a distant friend on Facebook, which read: "What r u doing now?"  What am I doing now?  I almost blurted out to say: "RIght now, I am breathing.  Or am I?"  But instead, I faltered and decided to remain silent.  I was doing so much and so little, all at the same time.  How could I respond to such a friendly, but misdirected question?  I let the messenger go empty-handed.