an unsettling dream

In the past year and a half I have not often had dreams about my dad, but last night's was quite unsettling!
I "saw" him across a crowded room. He was younger looking and fit, with no trace of Parkinson's Disease.  I tried to catch his eye, and followed him as he walked outside, calling to him, yet he didn't seem to hear me...
He was getting into a car and I was screaming, "Dad!!!!"
Then right before I woke up, we locked gazes...there was a hint of a question in his eyes, but no recognition...and I cried.

Sometimes I feel so alone.