Chantix - digestive issues, stomach problems

After taking Chantix almost a year and a half ago, the side effects I experienced (constipation, flatulence and a distended abdomen) have still not disappeared. It seems that maybe Chantix neutralizes stomach acid and causes the stomach to not produce acid in the future. :-( I'm guessing at the acid neutralization as I've been able to take large amounts of stomach acid (Betaine) without any heartburn.

I would love to hear from others if they have had this same issue.