Have Mental Health Questions? Ask a Psychiatrist Online
Hello from JustAnswer.
If you are having a significant panic attack away from home and do not have your usual medicine, then your only options would be to be seen in an Urgent Care Center or Emergency Room. Many doctors would not be willing to prescribe Xanax for chronic use, but they can address the acute symptoms.
If you would be able to arrange communication from your Psychiatrist to a doctor where you are visiting your family, then that local doctor may be willing to write a prescription of Xanax to last until you can get home.