I don't know if what I experience is similar to what you have, but often I get that "lump in my throat" feeling. I'll swallow and swallow, and sometimes the act of swallowing seems to help and other times it doesn't. As far as the acid reflux goes, when I have it there is definitely a burning sensation and backup of stomach acid into my esophagus. Often, I can taste it in my mouth too. It's nasty when it happens, and tastes terrible. Fortunately, it has gotten better, and I don't experience it as often as I used to. When it flares up, I take the generic for Zantac, and it always helps to get it back under control.
You may consider letting your doctor know the Prevacid doesn't seem to be helping it at this point.
Take good care,
If you keep a green bough in your heart, the singing bird will come.
To know what you prefer instead of humbly saying Amen to what the world tells you you ought to prefer, is to have kept your soul alive.
Robert Louis Stevenson