I completely had this moment one day before I moved, so I know the feeling.

I think most people here probably got a case of nerves before it was all said and done. It's a scary (but definitely exciting!) thing! You really are moving thousands of miles away! Of course you are going to be jittery about that, especially when you have worked hard to have the life you have now. I nearly had a panic attack one night before I moved, while I was going through some old things, thinking the same things - What if I don't make any friends? What if we won't get along once we are living together? What if I can't find my way around? What if everyone there hates Americans? I mean, some things I pondered were pretty extreme and silly, and some were legitimate fears. It is heavy, heavy stuff. But once I let myself cry out all the anxiety and nerves, and I truly thought about every question and answered it in my own head, I was ok, and I had the confidence I needed. For example, What if I don't make friends? My answer to myself: What a silly thing to be afraid of! I can't replace the wonderful, lifelong friends I have now, but I am sure I will make some friends there, even if it takes time. And I was right - I have been here just over a year, and I am finally starting to make some friends. I might be crazy for talking to myself, but someone had to reason with me!

You never know what your life will truly be like here until you get here. And in many ways, your life here will be as good as you make it. There will be a while where you may feel out of place, a lost sense of independence, a feeling of ignorance or stupidity because some every day things are confusing, and things like that. I think everyone here goes through that and I still go through those feelings from time to time. But if you move here knowing that there will be days like that, but seeing beyond those days into the days where you will feel right at home and happy with your husband and family around you, then you will be fine. It takes time to settle in. But life here is so much better than I ever thought it would be. I am so much happier than I ever knew I could be. I've never been nearly as homesick as I thought I would be. And things get easier all the time. It's been just over a year, I'm learning to drive again, I'm making some new friends (though still miss my old, irreplaceable friends) and my life is moving on.
Allow yourself to feel the anxiety, but maintain a positive attitude. Be realistic that settling into a new life will take time, but be positive that you will be fine. Believe in yourself -- if you have made this great life for yourself in America, then you can make a new one for yourself somewhere else, and it can be equally great, if not better! Hang in there! (((HUGS)))