Thanks for posting your query.
You are most likely suffering from acute viral gastroenteritis
Presence of cramps, nausea
suggests the diagnosis.
You should consult with internal medicine specialist and should go for thorough check up.
You should maintain your hydration status by taking oral rehydration solution.
Avoid milk and milk related products like butter, cheese and yogurt.
These viral infection generally persist for 3-4 days and get self cured.
You should take complete antibiotic course, antispasmodic, probiotics.
Dr. Mayank Bhargava