I think everyone pretty much answered your question but I do have one other suggestion. Briefly, I'll say that since last october I've been on Prilosec, Aciphex, and now Prevacid. The losec and Aciphex were not strong enough to completely shut down my acid...I didn't think...so I started Prevacid and I was still having breakthrough acid a few times a day, enough that I didn't think the medicine was working.
My doctor thought I was crazy and I wondered what was going on. Of course, when I tried getting off the Prevacid, I could see that it was working alot but only about 75%. Well, I was also taking probiotics to help intestines and constipation...when I ran out of the probiotics for a couple of days, I had no breakthrough acid. I bought some new probiotics and zap, I started having breakthrough acid again, even coming up to my tongue. Anyway, I stopped taking the probiotics completely and now, the Prevacid works 99%.
My theory is that there could be other medications or herbal remedies that also interfere with the PPI working correctly. Do a little experimenting if you are taking any other medications.
Good health to you inspite of this condition.