hello.... In the past two years I had thyriod cancer and had my thyriod removed and radiation theraphy and now take synthriod daily, since going on the synthyriod I have developed a host of other problems, tias, high blood pressure, migraines like I have never had before, weakness and mental confusion.... my high blood pressure is the lower number , which I understand is the more dangerous one to have high, my question is, I have been told synthyriod is safe, but do some people ever hae problem tolerating it? I am also on vit d theraphy for renal failure.... from lab work that was done..... I was told that was related to thyriod too?