Hi and thank you so much for this query. I am so sorry to hear about this backache and the troubling thoughts the high epinephrines level have caue=ls have caused you. If for real you have panic attacks, then this make the diagnosis of pheochromocytoma more likely as the two presently with same symptoms and only tests can make the clear cut difference. My utmost wish is that you get to meet and complete the evaluation so as to get a definite answer and adapted management plan. For the back pains, because you have had similar symptoms before and the ER only concluded on panic attack, it is not the best thing to return there because you may not get any thing different. But if the pains are so concerning, then you ay consider doing this. Otherwise you may patiently wait for the appointment with your internist and try to get all these addressed. I hope you find this useful and informative. If you have more questions, please ask us and we shall gladly provide answers. I wish you good health. Dr. Ditah, MD.