I don’t know what I’m looking for in posting this but I want to anyway. 
I am 27f, a bit overweight but otherwise healthy and active. Since I was in high school I’ve had manageable anxiety, no panic attacks ever, just typical anxieties day to day that I could usually quiet through meditation or exercise. On Sept 14, I had a full fledged panic attack and thought my heart was going to stop, my husband took me to the hospital where I was told it was anxiety and that my heart and everything else was fine. I was also given a prescription for Xanax, .5mg, that I have since taken 4 pills of. Since that first panic attack on the 14th I have had daily panic attacks lasting for hours, sometimes all night long. All of these attacks revolve around me thinking my heart is about to give out or that I’m going to stop breathing. That worry coupled with the physical symptoms of anxiety(shortness of breath and rapid heart rate) are keeping me in this state of constant fear and panic. I went to my regular doctor yesterday and she told me that I’m basically in perfect health and that made me feel better when I was in the office but the moment I left the panic set back in. I guess I’m looking for reassurance. The fact that this has set on so suddenly and nothing has been able to mitigate it is keeping me in that state of worry. I haven’t been able to go to work or really even go outside because I’m so scared. Nothing in my life has changed to trigger this anxiety. Has anyone else had this happen to them? I’m sorry for any spelling or grammar errors…anxiety.