What Causes Abdominal Pain, Severe Nausea And Blood In Stool?

In March of 2015, I became very ill very suddenly. My abdomen hurt so bad I laid on the couch and cried for almost 2 weeks. I was in and out of ER s maybe 6 times where I was continuously told I was fine, maybe a little constipated - I was almost 17 at the time - they told me I was drug seeking and being dramatic before sending me home with no answers. I finally got in to see a GI specialist. The first test she ran was a HIDA scan which we had asked doctors to do multiple times in ER and everyone refused. My HIDA Scan came back - my gallbladder was working at only 15%. I was scheduled for surgery the following Monday. After they removed my gallbladder, things got better, I wasn t in pain, I was able to eat and sleep fine, it seemed to have solved the problem. Maybe six months later, the abdominal pain returned, only this time it was more bearable. I went in to see my family doctor where again I was told I was probably constipated. He told me to ingest more fiber and maintain a healthier diet along with more exercise. I was willing to try but it sounded scarily similar to what I had been told only months before. I let the pain continue as I followed my PCP s instructions, but it didn t seem to be helping. At this point it had been probably 6 months again. The pain grew worse and I started experiencing nausea and headaches. I scheduled another appointment with my GI. They decided a colonoscopy and an endoscopy were our next steps. After the tests, I was told I tested positive for Celiacs Disease (March 2016). Finally, it felt like the end of my problems. I follow a strict gluten free diet which improved my overall health. Now, just a few weeks ago the abdominal pain returned along with severe nausea and the occasional blood presenting in my stool. I was back in ER when I noticed the blood where they did a CT-Scan and again told me nothing is wrong with me. I can barely hold down my food after a meal, I have on and off diarrhea constantly, and the pain is sometimes so bothersome I am unable to sleep. I called a new GI because I need answers, ones that will actually help me but no one can see me until at least mid-October. I am at a loss, I don t know what to do anymore - being 18 and having this many health issues is really putting a damper on college life. I have no energy anymore because my body is so weak and I can t sleep enough, I have to force myself to eat and then pray when I m gagging afterwords that I will be able to hold it down. I can t count the amount of times that I sit on the phone and ball to my mom because I am helpless to my own body. I just want to know what is going on inside of me.