Hi
I have experienced these exact same symptoms a couple of years ago and it was a truely horrible experience. I know exactly what you are describing, the feeling that you are not real and that you are not sure what is going to happen next - sometimes a bit of paranoia, panic attacks. I thought I was going crazy, but the worst thing was I couldn't describe what was actually wrong with me.
It just felt very.. strange and scary. Like nothing was real.
Turns out i was experiencing something called 'derealisation' and panic attacks due to stress related causes in my life. I went to a psychologist to help me understand and get over it, and with a LOT of support from family and friends, I got over it. They offered me drugs, but i said no. Thought it would make things worse.
A lot of people were worried about me, it was a horrible time and until this day i still don't know exactly what it was.
Fundamentally these odd episodes often last a while and can seem scary - but are usually anxiety related. Mine came from a fear of insanity, that i might go crazy. But with help you will get over it, I've never heard anyone apart from me who has suffered from this - hence the long post.
Anyway it only lasted a few months, just before my exams but i pulled through and to say I exceeded expectations would be an understatement.
I don't see it ever happening again because although I do feel a tad depressed every now and then, the psychologist helped me understand and prevent the symptoms of anxiety(you should look these up, acute anxiety can be a LOT more serious and psychologically damaging than given credit for).
Sorry for the long post, but i saw yours and couldn't help replying. I hope I've helped you in some way.