Thanks for posting your query.
With the available described details, there could also be possibility of acute viral gastroenteritis
You should consult with internal medicine specialist and should go for thorough check up.
You should also go for complete blood count
imaging, and serum electrolytes.
You should take complete antibiotic therapy, antispasmodics, probiotics, antipyretics, if needed.
You should maintain your hydration by taking potassium rich liquids.
Frequent loose diarrhea
may cause loss of potassium with weakness and fatigue feeling.
Avoid milk and all milk related products.
Dr. Mayank Bhargava