I have been treated with Synthroid or Levothyroxine for the past 4 years. In the past two years they told me I have thyroiditis. However, I often go thru stages of extreme tiredness. When I retest they say I'm in normal range. Why can't they up my normal range? Also, I am now losing hair which I never did at this rate before. I was recently put on Nexium which works wonders for that problem but I'm wondering if drug interaction can change your thyroid. Should I retest?? Also does anyone experience slurring or slow speach or saying the wrong word when you know what you want to say? This is driving me crazy! Is this thyroid related??? My specialist moved out of state so I'm being treated by family doc. Should I find a new specialist and start all over?