Thanks for posting your query.
Do you have fever/ watery diarrhea/ constipation/ spasmodic abdominal pain/ nausea or vomiting/ acidic belching/ mucus discharge during defecation?
With the available described symptoms, there could be possibility of acute viral gastroenteritis
Myalgia is an integral prodromal symptom of viral infection.
You should consult with internal medicine specialist and should go for thorough check up.
You should also go for complete blood count
and serum electrolytes.
You should take complete antibiotic therapy, antispasmodics, probiotics, antipyretics.
You should maintain your hydration by taking potassium rich liquids.
Avoid milk and all milk related products.
Dr. Mayank Bhargava