Diagnosing and treating thyroid issues hyper or hypo are tricky and subtle at the same time. I got lucky with one astute GP and the rest was 'on record' as they say. I did have a goiter years ago which was explored and thought to be a non-issue. My last endo sonogram showed the thyroid to be truly 'dead'. I had managed to save the tests from those ages ago as I'd gotten all my films a few years ago and this one was scheduled to be destroyed in a couple of months...I just kept it and it was useful for comparisons...
The thyroid and all the other endocrine glands are amazing organs in our body. They do far more than we realize or appreciate! But, also, they are dependent on the rest of our systems to help them work and work right.
Enlarged thyroid and levels out of sync are not hand-in-hand at all. Mainly because the treatments for thyroid can mask or help the issues. It's all about getting the right tests at the right times and a whole heap of luck in having the right doc! Hang in there! - j