A "feeling" of a lump in the throat with no obvious cause can often be down to anxiety. I should know, as I suffered with this on and off for 6 months or more, it's a viscous circle the more you worry about the lump the more you feel it.
Here is a link which I have in my bookmarks - which may be of interest to you: http://web4health.info/en/answers/soma-globus-anxiety.htm
Acid reflux can cause the feeling of having a lump in your throat. If the Aciphex has not imporved symptoms in 7 months, it is past time to try something else or to increase the dosage if possible. Effective treatment of acid reflux should eliminate the feeling of having that lump in your throat. Get back to your dr and see what other options you have for treatment.
Some times people require both a proton pump inhibitor ( PPI - like Aciphex) and an H2 blocker (Zantec, Pepcid...) taken at strategic times during the day to really control their reflux. For example I take Dexilant (PPI) around 2 PM and ranitidine (generic Zantec at bed time). I initially started taking Dexilant in the morning, but was having break through symptoms in the late after noon, so my dr told me to take it in the early afternoon. I will also take some Rolaids (calcium and magnesium only) if I am experiencing break through or I know I have done something that will trigger symptoms (eating spicy, late at night...).
Over time it is possible that uncontrolled acid reflux would cause barrett's esophagus, but it usually takes time and the early stages can be reversed. You should be able to avoid barrett's esophagus if you actively persue good control of your acid reflux.
I hope that helps you.