Another book that helped me a lot with panic attacks was How to Stop Anxiety & Panic Attacks: A Simple Guide... by Geert Verschaeve. He speaks very simply and clearly on panic and anxiety. He also advises against medication in his book. Again, I will say, make this decision for yourself. But these techniques he talks about are helpful with or without medication. Medication can help, but you won't completely be free of panic attacks without also learning mindful techniques to calm your mind. Watch this video, visit his website as well.