My attacks were mostly in my upper back between the shoulder blades. It was awful-I really thought I was having a heart attack. The first time I had an attack, DH was out and I called him asking him to come home b/c something was wrong with me but I didn't know what it was. It lasted for hours. My second attack came about a year later and was worse-I was in so much pain and almost having a panic attack also b/c I was so scared I was dying. I was thisclose to going to the hospital but DH calmed me down and in a couple of hours, it passed. After that attack I went to the Dr., who guessed it was gall bladder. I went for an U/S and that confirmed it. I scheduled surgery and in the month leading up to it, had attacks about twice a week. The first 2 attacks were the worst b/c I didn't know what it was. Hope this helps.