Hyserectomy symptoms and conditions

I am 26 years old and I thought I was having a heart attack last night. I seriously thought I was going to die. At work my feet and hands started to swell up really bad, but that went away pretty quickly. Then I started getting dizzy and feeling nauseated. My heart felt like it was going to beat out of it's chest and all I could do was think about it! I went and had my blood pressure checked at Walgreen's and they said it wasn't high enough for me to go to the ER, but I was scared. I was told I was having a panic attack to take deep breathes and try to take my mind off of it! Well that is hard to do when you are convinced that you are having a heart attack. Now I am experiencing pain in my lower back and having sharp stabbing pains near my left ovary and in my left shoulder down to my elbow.......when will this end? I just want my body back again!