There isn't sufficient information to give you a specific diagnosis.
Diabetes insipidus is the cause for the polyuria and you should meet an endocrinologist and have it treated accordingly. As for the rest of the symptoms you need to be examined so as to determine the cause for the rest of the symptoms and have it treated accordingly.
Next Steps
Follow the steps as advised
Health Tips
If condition persists or worsens visit the endocrinologist at the earliest