Anxiety Attacks

I just recently moved to a new city to work as an assistant teacher at a preschool. I've always dealt with pretty bad anxiety, but only ever had panic/anxiety attacks once every two or so years. Since early December I've been having these attacks at least once a week and I don't know what's causing them. I'm not on any medication, but why are they so frequent and what could I do to make them stop? Please help:(