midwest1

It's very unlikely this just "popped up out of nowhere." It's very likely your MD just didn't recognize what was staring him/her in the face for months or years. There is at least one thyroid/fibro expert whose theory says fibro is simply nothing more than a variation of thyroid disease, and that treatment with thyroid hormone fixes it more often than not.

Good news is that it's finally bad enough that someone sees it for what it is, and hopefully will know how to fix it.

More tests? Likely just additional bloodwork, unless you have an enlarged thyroid or nodules. Then you should have an ultrasound of the thyroid, and possibly a needle biopsy. But don't get ahead of yourself. Just worry most about finding the best thyroid doc you can to sort this out for you. You'd be amazed at the number of duds there are when it comes to this problem.

The best educational material for newbies like you is Thyroid for Dummies by Dr. Alan Rubin. I suggest you read it soon so you will understand what your doc is doing and what he may be doing wrong.