What Causes Pain In Abdomen And Back Along With Severe Gastritis?

I ve been having right side stomach pain, mild not extreme, orange soft stool, several times a day which is unusua for me. My stool is normally regular. I am having lots of stomach gas, which is causing back pain, and lots of stomach noises. I am slightly naseous, but no throwing up. I have had an ultrasound and Hida Scan, which were both normal, not showing any gallbladder issues. Tomorrow I have an appointment for a Gastro consult. I m so nervous about the possibility of a serious disease. It s bothering me so bad that I m having panic attacks. It seems like these issues came over night. They really stated acting up 1 week ago. What are your thoughts?