thyroid diet pills

.. I would like any tips about diet that could help before turning to some more pills( I have also a under active thyroid and taking tablets everyday but the dosage it's fine so it's not the culprit. ). I have heard that the GI diet could be a good diet to help to regulate the insuline and therefore help in weight loss. .. Has anyone tried this diet. I have been diagnosed with PCOS since 2002, my symptoms are excess hair on face and body and now I realise that losing weight has now become a real problem. ! I realised that it might be might PCOS getting in the way. !! I am getting desperate as few years ago I would have been a leat 14 pounds lighter by then. .. I am about 5'6 and weigh about 154 pounds and I am carefull of what I'm eating and I have been exercising about 4 times a week doing a lot of cardio and a bit of weights to tone up. .. I have been doing it since December and now we are in April I can say that all I have lost it's maybe no more than 4 pounds. ?? Does it work. ?? Please help as I'm getting sssssoooo desperate and fed up.