I was diagnosed with collagenous colitis 5 years ago. I started having GERD and nausea symptoms about 2 years after my diagnosis. Please have a scope performed to examine your stomach, an insist on tissue samples taken. It turns out that I had H.Pylori. After taking the prescribed triple antibiotic, my GERD stopped completely. I take Entocort on a regular basis as I have no remission since the colitis began. I had tried Asacol, but this was not effective and I found it caused my symptoms to get worse. My doctor told me that there is a coating on the Asacol that some patients are sensitive to. I'm going to try alternative therapies as long term use of Entocort is not suggested. So far, mixing bottled water and making a solution of slippery elm, marshmallow root, probiotics, combined with a powder packet of Cholyestramine has helped immensely. I have been told scientists are not even working on a cure for this disease, but it is linked to Hashimoto's thyroiditis.