I don't have any of these disease. My blood test shows normal free T4 and TSH. The problem is the nodule compresses the wind pipe and it caves a bit in x-ray.
Do you you have Hashimoto's or Graves Disease? Are you taking a thyroid medication of any type? Nodules sometimes shrink with treatment of hypothyroidism, if that's what you have... it may not get bigger.
You and your doctor must decide the best course, of action; we can't tell you what to do. What has your doctor recommended?