I Think The Ghosts, Spirits Are Getting Too Close. Now What?

I have always wondered about "ghost, spirits and the unexplained"

I was open to the possibilities that they do exist, however I never thought I would have my own "paranormal" experience. Even as I write this I'm not sure what is happening.

I live in a building with 6 floors. My son and I live on the 2nd floor, my sister and her son live on the 6th. Sometime in early 2009 my son (who was 13 at the time) was alone in his aunt's apartment. He was sitting on her futon watching T.V when something said "BAAH" or "BACK" in his ear. When he called me he was terrified and in tears. He begged me to come up and get him. All he kept saying is "Please mom hurry up" When I saw his face I fully understood the expression "You look like you've seen a ghost"

Before writing this I asked him to explain what the voice sounded like. He can remember everything about this experience and how it made him feel. But surprisingly he still has trouble explaining the voice, except to say it was "gravelly and low"

The next 2 experiences happened around 6-7 months ago a few weeks apart. Tyler was sitting at the computer using the webcam to take videos of himself. Just as he was about to record his video he noticed on the computer screen "a black shadow" moving along the wall behind him. He compared it too "a black garbage bag flying in the air"

This time when he called me he was scared, but not terrified (if that makes sense)

After talking that night we came to the conclusion that our building has spirits/ghosts and we can live with that. Now here is where I come in.

A few weeks after he had this encounter I had my own. I was standing in the kitchen just finishing the dishes when something made me turn my head toward our hallway mirror. In that brief second I saw a "black figure" actually in the mirror... Not in front of it, but inside the glass. Within a blink of an eye it was gone.

When I tried to explain to Tyler what I sawm, I couldn't. All I could say is it was a "black figure, with no distinctive shape

I don't remember feeling scared or fearful, just startled. I had already accepted that spirits/ghosts are here and it's no big deal, until yesterday.

I was sitting on the couch, surfing the internet when some kind of sound (that only my left ear heard) put my body and mind into a hyper-alert state and within a second I felt something breath in my ear and on my neck. It felt very personal and deliberate.

Has this happened to others? Is there a name for these kind of spirits/ghost?

Should I be afraid?