Welcome to HealingWell and the Anxiety & Panic forum. I am glad you found us. I have not heard of anyone being dx with all the sx of a panic attack in the ER and being told it was not a panic attack. That does not make any sense to me.................if you have the sx and nothing else was found what was your discharge dx from ER do you know? Just my curiosity :)
As I am not a professional, I do not have a guess at what else might be causing your sx but I agree you have sx and I would consider the advice already given here and seek out the opinion of another physician. Take care and I hope you come up with the right dx. Keep on posting as the members are very wise and caring here.