Suggest Treatment For Persistent Abdominal Pain

Question: Hi, my name is XXXX, I have been suffering from abdominal pain for the past year. Sometimes it can start in my upper abdominal or my lower right side and it spreads to my left with lost of burning and tingling nausea constipation and it ends with diarrhea, it can last for a week it goes away and it comes Back. I went to my Dr. And she prescribe me pantoprazole I been taking daily for the past 3 months but notice the pain again it didn't help I tried taking ibuprofen for pain but it doesn't help at all. I returned to my Dr. She send me to have cat-scan and stool test to check for H. Pylori the result were ok everything was good. That was the month of March 2014 then the pain went away and felt it again in the month of July 1 2014 I went to the ER the pain was horrible they did blood work, cat-scan and was normal. They gave me something for the pain and was discharged I notice the pain symptoms last longer this time at night I couldn't sleep I was finding it difficult to pass gas and having trouble passing stool I finally felt a sleep and woke up because I couldn't breath I felt a tight feeling on my upper abdomen the ambulance rushed me to the ER they just did blood work and it was normal. I felt that I was going to die the pain last for a while a month with out the pain going away I made couple of trips to the ER because of the pain but they can't find what is causing the pain. At the ER they checked my gallbladder, liver, pancreas and my right kidney but everything was normal. I have notice I feel the pain on my intestines the most. My Dr. Is going to refer me to a gastroenterologist I just hope they can find was causing my pain am so worried because I feel that it's just getting worst. I want to know of any disease that it's close to my pain and symptoms or if I may need a upper endoscopy or colonoscopy?

How can I provide the ultrasound report too you? Sorry Dr. I forgot to mention I also have a sour taste in my mouth almost daily.