Maybe it would help if you begin relaxation from inside your home? This is just a suggestion based on what my therapist is telling me to do , ha. I knowit sounds silly to 'just breath', or 'think of a safe place' but after awhile those seemingly small suggestions do help. Its harder to relax during a panic attack. You should begin your relaxation methods while already relaxed..that way when panic strikes, you will begin to deal with it more readily, more easily. Lie on your bed for 5 mins, 5 times a day and focus on breathing from your stomach , not your chest. Think of a safe place too if this helps. Then when you feel panic coming, just stop and look inside yourself...talk yourself through it. You are a strong person and you do have the ability to overcome this. I believe in you!