How can I stop myself from ''living in the past''?

I just keep thinking and missing all that I lived in the past, I really wish I could go back, of course I don’t regret my 2 kids, is just that I feel empty, we live in USA and we have no family here, my mom were living with us for over a year, but, she’s going back to Mexico in 10 days, it’s gonna be very hard for me to get back to our lonely lifes… I wish I could go back to Mexico and live there, close to my family, get a job, get to visit friends and have visits on my house, but Cd. Juarez is sooooo dangerous, that my husband doesn’t want to live there anymore…