I Saw Myself On The Way Downtown...

Suppose there are gaps in reality, as we know it. Kind of like blank spots, or holes, if you will. Now, suppose that these blank spots have millions of tiny little particles moving around at incredible speeds. Similar to the idea put forward by the author who wrote the book "The Universe From Nothing" (I think that's the correct title). So let's (abbreviation for: let us) take it to the next step, and let's theorize that all these crazy little particles that we can't see, moving at incredible speeds in these gaps in our everyday reality, which we occasionally might barely notice, if at all, in our peripheral vision, have the ability to create additional matter that then becomes added to our reality as if it's been there all along. A bit mind-boggling, don't you think?
I never really thought too much about it until recently. Oh, hell, I never thought about it until recently. I mean, I have had those moments of feeling like I'm not quite picking up on something that's happening around me. Or that feeling that someone, or something, wasn't there a minute ago. But I always put it down to momentary inattentiveness, or a little touch of paranoia.
Well, to understate the case, I had quite shock a couple of days ago. It was the kind of hot, humid day that suggests you're really in the middle of a tropical jungle, instead of southern New England. It was late afternoon, and I was trying to get to the Post Office before it closed. I was stuck at a red light. The sun was shining strongly, not a cloud in the sky. I happened to look over at the car next to me, and noticed it appeared to be a new Subaru, similar to my sister's, even down to the same dark color. As I watched, the tinted passenger side window glided slowly down, and I found myself staring at what appeared to be, me. Even the round reflective sunglasses looked exactly like mine. He looked exactly like me, but he gave off a really bad vibe. It's very difficult to describe how I felt. The best I can do is to say, a hole opened in the world around me, and I could feel a strongly evil presence. I felt threatened just by his looking at me. As he stared back at me, he removed the sunglasses in a slow deliberate manner. Having looked into my eyes in the mirror every day, I could see that his eyes were my eyes. But then again, they weren't. There was something wrong with them, but on the inside. Looking into them, I could see he was amused, but not in what I would say was a nice way. Not in way that meant well towards me. I felt like all the blood in my body had turned to ice. Then, as I still stared, this apparition casually put the sunglasses back on, and continued to watch me, as the passenger window went back up blocking my view. The light had changed, and the other car pulled away. I sat there for at least a good minute while the vehicles behind me were beeping their horns, but I really wasn't paying attention. I was completely stunned. My brain had ceased operating. And I still felt so cold, I had to turn the air conditioning in the car off.
Of course, now that it's over, my mind is working overtime in an attempt to deny that the entire incident could have happened at all. And I can't blame it. My world seems to have come to an end. I just wish  I had an inkling as to what world I'm actually in, now...