Welcome to the forums Luna1. :)
As strange as it may sound, your experience isn't at all uncommon. Many have experienced similar things.
Those who pass out of bodily presence into Spirit presence can still make contact, they just have to do it in other ways. He came to say Goodbye to you. They often will do this for those they love.
Feel Blessed and well loved that he wanted to take the time and effort to say "Goodbye For Now" to you.
"If you want to understand the Secrets of the Universe think in terms of Energy, Frequency and Vibration"
Nicola Tesla 1856-1943
When asked by a reporter how it felt to be the smartest man alive Einstein responded "I wouldn't know, ask Tesla."