I keep blacking out and don't know why?

I have had these episodes of blacking out happen to me five times before in my life. The first was when I was in my early twenties. I am now forty three. The most recent one was two days ago. It is always the same experience. Here's how it happens:

It starts with a sudden feeling of nausea out of no where, then my head gets a "hazy" and "heavy" feeling and I feel as though I'm going to vomit. I never do though.

Within a second I lose peripheral vision in a "fog" around me.

I know I have just lost all control and have just collapsed because I can literally hear things crashing around me as I hit them going down. Or just the "thud" of my body hitting the floor. I then black out completely. I don't know how much time has passed but I would guess at under a minute? Twice I had witnesses around me who say that I'm not convulsing when I black out, just making strange breathing noises and I'm completely out for about 5-10 seconds. Then slowly I come out of it still in a "haze", but without the nausea?

I always awake on the floor and feel lousy and disoriented. This feeling is like one of being awake for too long. It stays with me sometimes for a few hours sometimes all day until I have slept and awoken the next day.

In this last "attack" I hit my head on my sofa table which was next to me, Again I heard the items on top of the sofa table, and the table itself, crashing and falling around me. I don't feel anything as I hit things and I can't see. When I awoke on the floor, I had a lump in my head, and the table was completely knocked over.

Is this epilepsy or am I just blacking out? I have to ask because of what I have read on-line it appears that most epileptics have no idea of what just happened. Where as I have vivid recollection of events and am aware of what just happened?

I don't have medical insurance to see a neurologist and have passed all diabetes tests previously given to me. I have a family history of diabetes and have had tests done. Always negative for diabetes. I say this because a friend keeps insisting that is some kind of blood sugar crash. I disagree.