Welcome to healthcare magic,
As per the description of your symptoms , you have been suffering from hypothyroidism
therapy is generally recommended in patients who are having PCOD problem with either obese, or got insulin resistance
. In this regard I advise you to check for the blood sugar levels , if you have got impaired glucose tolerance
then it's necessary to use metformin, another situation is overweight
..if you are overweight means, you must use it even if your blood sugars are normal, why because , overweight in future definitely causes insulin resistance and another important thing is metformin reduces your weight and decreases insulin resistance.
But I advise you to consult a treating physician before that..