I was also told that I was having anxiety attacks, that it was all in my head and that I needed therapy. This was BEFORE my MG dx. I was having chest pains as well. Turns out I had thymoma and because of some other complications, it was causing the pain in my chest. But the ER's solution was to tell me to "breathe in through my nose and out through my mouth and try and relax". It was so humiliating. Stand your ground. You know when something is off and even medically trained personnel may not recognize what is happening to you. When I had my thymectomy, I was the first patient that particular anesthesiology team had done that procedure on at the time. I tend to be a bit defensive about such occurances as having MG can be a lonely thing. Best wishes!!!