Thanks for posting your query.
Do you have spasmodic abdominal pain/ fever/ vomiting/ excessive flatulence/ watery shit?
You are most likely suffering from acute gastroenteritis
and because of potassium loss, you are feeling weakness.
What is your hemoglobin
If you are suffering from worm infestations or "pica", both of these condition may cause anemia with abdominal pain but never cause watery shit.
You should consult with physician and go for following investigations: complete blood count
, stool examination and ultrasound
Get well soon,
Dr. Mayank Bhargava