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Usually acidity and diarrhea since long most likely occur due to Gastritis
and as your endoscopy
is also more or less normal and You have taken complete antibiotic cover also for H Pylori still you are having symptoms so there may be possibility of some other problem.
for 3 months is also proper treatment.
The other possibility we can think is Irritable Bowel Syndrome
, its characterized by frequent diarrhea and bloating gastritis in a person without any obvious causes found. Some times constipation
may also seen. Best way is to do daily exercise, Pranayam helps, and medicines such as Libratax and other anti anxiety medicines are used. (Only under expert advise)
thanks take care