Have you been on any medications? Does this happen everyday? Do you notice it happens when you are under more stress then usually?
I would suggest going back to the doctor and see if he would be willing to try an anti anxiety medication that you can take when you start to feel these attacks coming on. There is a medication Ativan that you can have to take only when you feel like you are going to have an attack. The ativan will stop the attack from getting to bad. There are other medications that you could take every day to prevent the attacks from even starting. It does sound to me like it is a type of anxiety attack and a doctor could look into what medications would be best for you so that you can live your life without worrying that the attacks will come back. I hope this helps and I wish you luck