hello deepa
this is dr yash, i have gone through your question.
At the age of 11 acidity is unusual. you have mentioned that you have taken all type of treatment.
Have you gone through upper GI
endoscopy, 24 hours PH monitoring (which tells yours stomach acidic level), breath urease test?
At this level i am suspecting H.Pylori infection because you have almost 12 years of history.
you should avoid spicy food.
TO diagnose H.pylori infection endoscopic guided
biopsy should be taken from your stomach, till then you can take
proton pump inhibitor (tab Omiprazole 20 mg before food).
I think i answered your question , if you have any other question feel free to ask.
thanks