Thanks for posting your query.
You are suffering from acute viral gastroenteritis
with secondary bacterial infection.
Presence of watery diarrhea
along with body ache
suggests the diagnosis.
You should consult with internal medicine specialist and Shields go for thorough check up.
You should take complete antibiotic course along with probiotics , and antispasmodics.
You should also maintain proper hydration by taking oral rehydration solution, lemon water, banana.
Weakness in body is due to loss of potassium in stool.
You should also take proper bed rest
Dr. Mayank Bhargava