Thanks for posting your query.
You are most likely suffering from acute gastroenteritis
Presence of watery diarrhea along with heart burn suggests the diagnosis.
Imodium helps in decreasing gastrointestinal secretion and cause constipation
It should not be taken if there is suspicion of infective pathology.
You should consult with internal medicine specialist/ gastroenterologist and should go for thorough check up.
You should go for endoscopy
along with duodenal biopsy and colonoscopy
to rule out any mucosal pathology.
You should take complete antibiotic therapy, proton pump
inhibitors and antiemetic.
Avoid milk and all milk products.
Avoid tomatoes, cirtus fruits, onion, garlic and oily foods.
Dr. Mayank Bhargava