Here's a good site for thyroid info: http://www.stopthethyroidmadness.com/

And a message forum: http://forums.realthyroidhelp.com/

My thyroid issue was hard to deal with because I don't convert enough T4 -> T3 and no one ever checks it. I had Free T3 levels below range. Only taking natural thyroid hormone has helped, because it contains T3 and T4.