Hi Reina29,
I was diagnosed with hypothyroidism since I was 18 and that was thirty years ago. My edocrinologist told me that mine was caused by an auto immune disorder. I have it's tested every year with a bloodtest. I take a daily supplement everyday. I think if a person is low on thyroid it can cause depression. I think you should get tested yearly, even if it's expensive - you're worth it. That's one good thingabout Canada, is it's free.