Well it sounds like some sort of anxiety for sure, but since no one here is a doctor, just go have it checked out to be safe.

I do know what you're talking about with the symptoms though. There is a history of mental illness in my family, and I also experience short bouts of anxiety. My deal is that I just worry about things I have to do, whether its turning in a paper or going to a wedding. My mind will just totally focus on those upcoming events and make me question every little thing. And if I'm at a really busy and hectic point in my life, I too feel overwhelmed and out of control. My mind just takes over and I analyze things way too much while the rest of the world seems to pass on by. Those things I have to do or had planned on doing are constantly on my mind. It's a total involuntary thing too, like I don't just sit down and start worrying. So I know where you're coming from, but at the same time, I don't think my anxiety is quite as severe as yours just yet. So if you're still having trouble, just go see a doctor and tell him/her exactly what you told us. Hope that helped man.