My Own Inception Moment

The History Channel is one of the few channels I have. I am watching a fascinating documentary on Area 51.
Okay, really, it is just someone's conspiracy theory that had enough financial backing to make into a documentary. It has caused me to ponder the following:
If we mastered time travel and went back in time and changed history, would we know or would that just be our history?
Would the current history still exist in our memories, or would this new history just be the history we lived? And if we weren't able to remember the first history, how would we know if this HAD already happened?
What if the life we are now living is just an experiment that someone is conducting to see what different tweaks in history do to change society?
What if deja vu is really just a moment when a previous history is so similar to the new history that we remember living the old history?
What if sometimes the experimenter is in a weird mood and just wants to mess with us so they just throw something random out there for their own entertainment?
What if they laugh when people get really heated over things like politics or what "Cindy Jones Anderson" posted on Facebook today?
How do you think you would go about getting a job as a scientist at the time travel division of area 51?
Who would like to begin a fund to pay for me to have more TV?
UPDATED:
After I posted this I went to my mail box. All of the mail there was for my sister, and it used her maiden name. She has been married nine years. This house didn't even exist nine years ago...or did it?


UPDATED X2: The comments section of this post freak me out more than just a little...