I Suffer From Extreme Anxiety And Panic Attacks Come On

I suffer from extreme anxiety and panic attacks come on very easily. I had been using alprazolam 0.5mg since 2001 (1/2 tablet morning and evening, or as needed), but as of July 1, 2018, my doctor can no longer prescribe for me and said I have to have a psychiatrist prescribe it. My problem is that I can not find an available psychiatrist (which takes my insurance) until August 23rd for 1st available appointment, and don't know what to do while waiting, which has increased my anxiety. I had 1/2 of a tablet left as of yesterday, July 12th, and am fearful of a panic attack hitting me because I will end up at an ER, not knowing whether it is a panic attack or heart attack (symptoms are quite similar). I have nerve damage in my left arm from a ling surgery in 2010, and my left arm and fingers in my left hand are always (24/7) numb and tingling). What can I take besides camomile, lavender, and breathing in and out of a bag?