Deja-vu...only paradoxical and intense?

I remember when I have deja-vu very well, and I am quite used to it normally. I have experienced it since I was very young. A few of these events seem to stick in my mind, mostly what it's about when it happens .

A few minutes ago, I was reading my old...

blogs, and right as I was returning to the homepage, I sank into deja-vu, lasting a few seconds as usual. Only it was surrounding an event chain that I had deja-vu-(ed?) about a year and a half ago, when I originally signed up on a social site. It was exactly the same as the last time and as the time before that. What I can't quite grip correctly is the fact that I can't remember ever being in that exact situation before the one that just happened. This event chain (me returning to the homepage after finishing a blog and re-reading others) happened once, here, just now. So why am I having a seemingly DOUBLE deja-vu about this same event, from years ago? something that (couldn't have) happened exactly the same way as the original(?) sequence that I just experienced?

I was looking at the rose picture right after I clicked home and It hit me as the page loaded. I thought I might have started falling out of my chair from the vivid depth of this double deja-vu. I had never felt one so engaging.

Scientific explanation for deja-vu...it's a *short-circuit* in the brain that makes you think you've experienced something before, when really, you're only doing it for the first time.

that happend to me too like almost a dream but...not?!

Follow-up:

I suppose its merely a momentary chemical imbalance then eh? That is acceptable, I'm kinda concerned about the severity of it. I'm a bit more awake now and I remember it well. I can describe it metaphorically now:

It's like I was rising up into the atmosphere, from inside a very tall building. When I reached the roof in this vertical tunnel (the normal s.o.p. of deja-vu for me, which I usually sit at for about a second before falling) I crashed trough it and climbed further, faster into the outer reaches where the air is thin and cold, with no clouds. I then topped out and started to fall. I descended in a blur back down into normal, active, not brain-tumored(?) consciousness. This whole 'episode' lasted about 10 seconds. It wasn't anything like a blackout, more like a whiteout of a deja-vu.
And the feeling of repeating memory was very disorienting, like re-writing something that was never written.