Whats going on with my digestive system?

I have had acid reflux since early childhood where I remember complaining of a sore throat, although I was a very difficult baby with very bad colic, which I think may have also been caused by acid reflux. From that point, I remember often having severe burning sensation in my throat and pain in my chest, constant stomach pain, bloating and gas, a bad taste in the back of my throat and nausea. I also was having constant hoarseness and losing my voice often, usually in the winter. Throughout my life, I have had recurrant and constant problems with constipation, sometimes having two weeks where I wouldn't go to the bathroom. I also usually bleed when I use the bathroom, even when I haven't been constipated. 

At 19, after years of complaining to my doctor and being told it was nothing, he finally did an endoscopy and found that I had barretts esophogus. He then started me on various medications, the only one I found really helpful being nexium. Even with the nexium the acid was still not under control, and eventually I was prescribed 3 nexiums a day in order to control the acid. During this time, it was also found that the acid was going into my voice box and was also possibly going into my nasal cavity. 

Since this time I have had various tests, all of which have come out abnormal. These abnormal results have included a hiatal hernia, a weak valve,  gastroperesis, a swollen stomach, damaged upper intestine (I was tested for celiac, the test came out positive the first time, negative the next and the biopsy came out negative) and most recently I had a signoidoscopy which came out with a result of possible colitis, although I haven't been able to see my doctor to get the final results yet. 

My question is, has anyone with severe gerd also been found to have problems with the rest of their digestive system as well? If so, does anyone have any clue for why this would be the case?