Thanks for posting your query.
You are suffering from acute bacterial gastroenteritis
Presence of watery stool and abdominal pain
suggests the diagnosis.
You should consult with internal medicine specialist and should go for thorough check up.
You should take complete antibiotic therapy, probiotics and antispasmodics.
You should maintain hydration by taking oral rehydration solution, lemon water and juices.
You should take potassium rich diet such as banana, coconut water.
Avoid milk and all milk products for coming 5-7 days.
Dr. Mayank Bhargava