Esophagus Stricture

I have been diagnosed with a stricture in Esophagus 2 years back.  I always had issues with swallowing pills and everyone in my family was under assumption that I'm scared to swallow pills but when I happened to mention this to one of physicians he suspected if I have any issues and kept me on barium swallow test in which I was failed to swallow the pill. After that I have seen a gastroentologist, he tried to dilate but it was no luck, I had more irritation in my throat after the endoscopy is done, it was painful for couple of days, actually it became worse that I couldn't swallow food. After coming to know about one of the famous gastroentologist in DC through one of my friends, I visited this doctor and he performed the endoscopy procedure, it wasn't painful at all and surprisingly I was able to swallow pills, It was like miracle for me in my life, I was able to swallow the big fish oil pills too. But unfortunately after an year in 2008, I started having the issue again. This doctor when he performed the endoscopy he mentioned that  I do have a web in the esophagus. He also took the biopsy test and there was no problem. I want to know if there is any good Gastroentologist in Boston area who can help me out with this problem. Please let me know if any one have any information or if any one is facing the same issue like me.