If the meds you are on are proton pump inhibitors it could take about 7-14 days. It takes that long for the 'build-up' effect to take place. I hope your doc has also recommended a GERD diet as that may also help.
Call the doc and inquire if a diet change would help. After being treated for H. pylori most docs recommend that patients start acid suppression meds because H. pylori causes changes in the output of acid and their presence often results in gastritis.
If your son isn't seeing a pediatric GI person, you may also want to ask for a referral to one. And if testing hasn't been done - over and above finding out that the H. pylori was present - it may be time to have some done.
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