Hi. I have exactly what you are describing. Everyone is different and yours may be from something completely different, but here is my case. I have had my gallbladder removed years ago. So my pain isn't gall bladder. I have dealt with this for years, ER visit after Dr's visit, multiple tests, CT Scans, MRIs, and Endoscopys, and ERCPs. Not everytime, but over half the time, especially when my attacks are really bad, my liver enzymes shoot out the roof. I burp, abdomen gets really bloated, same constipation as you describe, really fatigued, nauseated, pains that shoot through to the back right side, a squeezing excruciating pain in the middle of my chest and just below my ribs. I have had stress tests, CTAs, and ekg. My heart is fine. My gastroenterologist has now referred me to Duke Medical to a more advanced clinic. They now suspect shyincter of oddi. In layman's terms, the muscle beneath my liver is not opening properly and causing bile to back up in the liver. They have found I have mild to chronic pancreatitis.