It sounds like you might have very mild anxiety, caused by the concerns about this indigestion problem and the possibility of it recurring. You might want to check out the anxiety and stress forum -- there are several threads on the sensation of having a lump in the throat, since it's a very common symptom of anxiety. Try posting this there, too.
I had the same sensation all summer, and saw an ent about it, who thought it was reflux, even though I have no other symptoms related to gerd. I tried nexium, but like you, it didn't solve the problem.
This lump sensation could also be a result of nasal drainage or allergies. About the most effective thing for me has been a neti pot. Look up "nasal irrigation" on the web, and you'll find all sorts of resources. Essentially, you add 1 tsp salt and 1 tsp baking soda to 1 l/qt of warm water, and use the neti pot to pour the saline through your nasal passages. It rinses out pollen and dust that you may be reacting to, as well as moisturizing the sinuses. This helps to prevent drainage, and reduce the throat symptoms. You can find neti pots at whole foods or many yoga supply stores.
Learning to live with the symptom also helped it reduce. If you're thinking about your throat all the time, you're always aware of it, and more inclined to listen to sensations you would otherwise ignore. The more I told myself, "this is not a big deal -- nothing bad is going to happen," I started to believe it, and (amazingly!) the lump sensation went away pretty much on its own after that. I occassionally have a feeling of some constriction in my throat, but not anywhere near as bad as this summer (when my anxiety was also at its peak).
I may be way off the mark on this one, but your situation sounded way too similar to mine for me not to say anything. Know you are in my thoughts and prayers.
Peace and blessings,
paul
