My entire back, abdomen and even ribs gave me horrible pain last night and?

I went to the ER. It came on suddenly. Like it started down by my back and worked its way up into my shoulders and ribs. Then radiated to the front upper abdomen and in my chest. It hurt so bad no matter what position i put myself in I was in HORRIBLE PAIN. It came and went....It hurt to breath because it felt like someone had tied a rope around me and squeezed kind of. When the pain started, I got weak, got cold chills and started shaking. The ER told me I had the stomach flu! No way,. they didn't do xrays or anything. They also said my white blood cell count was very high and they weren't sure where the infection was. Today I'm not in as much pain but i am VERY SORE. My back and everything still aches and at times it feels like the attack is going to come again but it don't. Any ideas what this could be, because I have a feeling its not just the stomach flu. By the way its not my gall bladder , I had that removed 5 months ago.