Beth, if you have a plan to be able to stay behind successfully, I would go with that. Especially if your parents feel you're responsible enough to make your own choice. It sounds like the thought of making this move is practically making you sick. I remember feelings like this when I was young. It wasn't pleasant at all.

I was given a golden opportunity to move to a much nicer house while my kids were in high school. I refused to move so they could graduate from the school they wanted to graduate from. I felt they had moved enough in their lives and it was time to stop changing their lives to suit everybody elses. I know this doesn't describe your situation. I just wanted to tell you the story so you could see that I know how you feel.

Go with your gut feeling on this. I'm not saying the grass isn't greener in Arizona. Who knows? Just do what feels right to you. My .02 cents