I usually have dreams, that are pretty "real" I saw two towers in New York, burning and I was thinking it might be 9/11 or another 9/11??!? i'm not guite sure how to handle these dreams? but its frigtens me. As it reminded me of 9/11. I thought this was a good please to warn people about it, u know the 7 years of cycle, its been a cycle, of two now. And I'm just having this gut feeling.
don't worry. the odds of something like that happening again, especially in New York, are low. you are probably worrying yourself which is causing the dreams. if you were personally effected by these events, and as you said noticing 7 year cycles, your suppressed fears could be flaring up causing the dreams. talk to someone about these feelings if they are suppressed emotions surrounding the attacks.
it could also be symbolic. without knowing the full dream, it could be warning of danger surrounding a trip, or if you were with your partner in the dream it could warn disaster with them. not saying a planned outing or relationship will result in death, but it could end badly. a trip could be full of stress, or you loose your luggage, or break your leg. a relationship could become abusive or they may cheat. this is if this dream is a warning. look at the whole.
As scary as your dream might have felt at the time, dreams are oftentimes symbolic and have very little to do (if any correspondence at all) with literal meaning. That's not to say that dreams never have literal meanings, but most times you'll find that the symbols and situations that occur in your dreams are subconsciously related to elements in your own life, and your subconscious is interpreting these situations to you in your sleep in the form of symbols such as the horrifying events of 9/11. Unless you know for a fact that you are a precognitive psychic whose visions come in the form of dreams whose symbols are always interpreted literally rather than symbolically, I would not worry too much.