3angels. I'm sorry you're facing this dilema. I guess everyone will havea different view on this. Personally, I'm really stubborn, and tend tostick things out, determined to make it work once I've made the decision. (Sometimes I stick at it long after I should've given up).
I would maybe set a time in your head, maybe next summer, and stick it out till then, and if you're still unhappy, have a big talk with dh & kids & decide then.
In the mean time, so's you don't get too depressed try & organise visits to Tennessee eg for thankgiving/Christmas, or people to come to visit you if time & money is available.
Moving from a quieter place to a big city is bound to be really daunting & scary at first. You will adapt to the faster pace quickly (I know, you probably don't want to).
I'm really sorry, it must be desperately frustrating to be homesick. How do your kids feel about it. I suppose you'll need to be positive & strong for them, especially starting new schools, which is scary, and this must be harder if you're not 100% enthusiastic about the place yourself. Hope the dust settles for you quickly.
(ps you still trying 4 n4?)