I took Prevacid Solutabs 30mg x 2/day for about 3 years. It worked better than anything else I had tried. After 3 years, it stopped being as effective. Before that, I was on a single dosage of PPI that worked for a few years.
I tried Nexium x 2, Aciphex x 2 and Zegrid x 1 & x 2 after the Prevacid became ineffective. Zegrid helped a bit, but isn't covered by insurance. The others didn't help and actually made my symptoms worse. Right now, I am looking at the surgical option since the PPI's aren't working well.
Based on my successful 3 years, I would definately recommend at least trying the double dose PPI to see if it would work for you.