But hypothyroid symptoms is rashes. And itchy head and back pain and I got all that?

I'm not 100% clear ? on what it is that you would like to know, but I think you are concerned that your itching and back pain are potentially related to hypothyroidism. That is a legitimate concern if your hair is especially thin and brittle, if you have very dry skin, and if your depressive symptoms have worsened despite medication. Consitpation, fatigue and weight gain are also symptoms. Ask UR Doc about testing.