It appears that maybe the lack of nicotine has caused some change in your
stomach.
Ten years ago, I developed a second ulcer, and I have taken one OTC
Prilosec a day for 10 years with no problem. Why not try an experiment and take one Prilosec or Prevacid a day for 4 days to learn whether your heartburn has stopped? The stronger pill, Nexium, has just become available OTC and may deserve your consideration.