@jm319,
Did you ever have terrible stomach pain and fever when you were around 12 to 14? The day I was hospitalized because of severe abdominal pain, I thought I was having a heart attack. For me the pain started around my waist and crept up until my entire torso felt like a vice. I could barely speak I was in so much pain. My son was only about 3 or 4 and I sent him to the next door neighbor for help.
I only mention this because if you get a gallstone it can be crippling, and when you are young the docs don't think gall stones. So, please if the pain becomes terrible, call 911 and get to a hospital.
I must repeat that I am not a Doctor, I can only tell you what my experience was. I hope you get a solution soon, and I hope you don't have to experience what I did. Pester your doctor for further tests, and I hope you get better soon. Good luck.