Dr Harold Levinson wrote a book called "Phobia Free". It should be in your local library, or you can buy it online.
In the book he gives instructions on how to get rid of panic attacks and phobias.
He utilizes over-the-counter liquid antihistamines and other safe meds.
He has written several other books also.
His office is located in Great Neck, NY. If you are close by, just give them a call.
I know a few people who have been helped by him, and it has changed their lives.