do I leave my fiancé?

This is so hard for me. I've been with my fiancé for a long time now. I have a daughter that's not his but he's always treated her life she was. We are still really young and he's in the military. He wants to get married within 4 months or so.. but the problem is.. he lives on the opposite side of the country and that means I'd have to leave my entire family. I have really bad anxiety when I even go in road trips and I don't know how it's going to be living by myself with him and my daughter there. We will be living there for over 4 years and it's stressing me out so badly. I wish there were a way he could just work here it would be so much easier on me 😫 what do I do!?