Hi there,
Welcome to Just answer!
Well, being a mental health expert i can only modify your current treatment and provide you the best possible option to treat with your panic attack.I am not aware of any herbal remedies,if you still want to carry on with the conversation , then please reply and tell me if you feel palpitation(increased and pounding heart beat), fearfulness, feeling of impending doom, chest tightness, breathlessness, when you are in a social situation?