Paranoia followed by amnesia

I've posted in the dissociative forums before under different identities, but I'm posting this here because I'm trying to rule out paranoid schizophrenia.

Lately, I have been having episodes where I will become very disoriented, lose parts of my memory, and start feeling very paranoid or fearful that I am in grave danger. Usually I catch myself in time and bring myself back to reality, but a few times I have tried to "run away" from my home. I woke up in a town about 4-6 miles away last week, and the cops ended up taking me back home.

The next day I was walking to the library and it happens again. The next thing I know, I'm sitting on a bench outside of the grocery store smoking a cigarette, even though I was supposed to have quit smoking.

I am freaking out at this point and trying to downplay the whole situation. I get drunk the next day, and apparently my roommate found me wandering down the hallway saying "please don't hit me," and I did not recognize him at all. I don't remember this at all. I was also on the phone with my parents asking them where I was.

I used to be extremely paranoid as a child, but this hasn't happened to me in years. I also find it strange that I remembered my address, where my room was, and who my parents were, and how to use a phone. Why do I remember these things if I don't know anything else?

I should mention that I was probably slightly intoxicated when I wandered off the first time, and I was drunk in the hallway. All the other times, I was sober.