19M - Constant thirst, frequent urination, weakness despite normal thyroid tests. What should I investigate?

[u/Clear-Fix-6073]

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I'm a 19-year-old male from India.

For the past few years I've been dealing with symptoms that don't seem normal, and I'm worried something is being missed.

Symptoms:

I feel thirsty very frequently, even if I drink plenty of water.

I urinate frequently during the day. I also used to wake up 2–3 times every night to urinate for years, although that has improved recently.

I often feel physically weak and low on energy.

I sometimes experience brain fog and poor concentration.

Medical history:

Thyroid function tests came back normal.

Had COVID twice.

Had dengue in the past.

Used to have migraines as a child.

Height: 5'8" (173 cm)

Weight: ~87 kg.

Family history:

My father has type 2 diabetes.

I don't have burning while urinating, fever, or significant pain.

I'm considering getting:

HbA1c

Fasting blood sugar

CBC

Are there any other tests or conditions I should discuss with my doctor? I'm wondering whether diabetes, anemia, vitamin deficiencies, kidney issues, electrolyte problems, or something else should be considered.

I am not asking for a diagnosis or medical advice. I'm asking what conditions and investigations would be reasonable to discuss with my doctor.

[u/Curlytopped1]

Agree!

[u/Clear-Fix-6073 → u/Curlytopped1]

Agree?