Hello ,I am 16 years old nearly 17 and I have been suffering from irregular and skipped peroids for the past 2 years now , however in the first year of me starting my peroids I have regular peroids. I am also type 1 diabetic for the past 10 years and I take thyroid tablets .evenmore recently I was told that I have a low iron and hemoglobing and vitamin D in my blood? I have a feeling the low iron and Hemoglobin could be the cause as my thyroid is quite regular as checked Could this be the reason? Thanks Sheena