Hello, I have had several thyroid test done, my function test came back normal. But, I have an enlarged thyroid. Since November, I have a cough . I have been told by one Dr. that the enlarge thyroid is causing the cough, and then another is trying to send me to a Respiratory Dr. ? During this time, I can tell, the growth is getting larger and the cough is getting worse.What should be my next step ?