Thank you for your query on Healthcare Magic,
With your symptoms of excessive urination , excessive drinking , it is better to go for investigations like urine for sugar and blood for fasting and postprandial glucose
to daignose whether you are having diabetes
And go for thyroid profile testing to rule out the hypothyroidism
as per your symptom of excessive sleepiness and daytime dullness.
So consult your Physician for physical examination and investigation.
Hope I have answered your query.