I am a 19 year old female, 5"3 avg weight. A few days ago, I began having a pain on the left side of my chest right around my left breast. The pain worsens if I poke or prod it. I have had intense backache (lower and upper). Pain is in my arms occasionally. I have shortness of breath, smothering/choking feeling. I am currently menstruating, and I am wondering if any of these symptoms are related to that. Also, my entire chest area feels heavy and tight. I'm scared, and last night I had the worst panic attack of my entire life. I read something on the internet about those symptoms being heart attack symptoms, and i flipped. I was laying in bed about to go to sleep, and I had a pain in my chest hit hard all of a sudden, couldn't breath, felt this sense of impending doom/dread. I felt like I was dying and that I had to get out of that situation as fast as possible. I was shaky inside and out, my heart was pounding. This lasted a few minutes til I took a valium to finally get to sleep. Was this just a panic attack or something heart related. I do have anxiety disorder, but i have never experience something like this before. Any answers will be most helpful. I am litererally making myself sick. I am nauseated. The craziest thing is that earlier that morning I had taken a 12 hr midol, and these symptoms started creeping back up when the 12 hr's was up, which makes me think I am just having a lot of panic/anxiety. I've read about panic attacks, I know the symptoms, but feeling one happening to you is entirely different and I never want to feel that way again. Please help. I'm a wreck.