Hello,
Without examination confirmation of a diagnosis is tough but frequent urination(polyuria) can be due to diabetes mellitus.Other possibilities are diabetes insipidus,glomerulonephritis, pyelonephritis(inflammation of the kidneys),urinary tract infection,hypercalcemia,hypokalemia(low potassium),hyperthyroidism,hyperparathyroidism,diuretic drugs and benign hyperplasia of the prostate(in males).
In my opinion, investigations like kidney functions, blood sugar levels, ultrasound lower abdomen ,intravenous pyelography ,prostate specific antigen blood test,thyroid function tests and cystoscopy may be needed to confirm a diagnosis.I sincerely advise you to consult a urologist or nephrologist and get yourself evaluated so that a confirmatory diagnosis can be made.
Hope it helps.Take care and pls do keep me posted on how you are doing.
i am a female... why would you suggest a prostate specific antigen blood test?