The 3mm nodules in the thyroid should be observed over time. There is no indication for biopsy and these are not capable of causing any symptoms. Repeat ultrasound in 6-12 months.
I would go to a good Endocrinologist. They handle all the Thyroid issues, etc. I have some of the same issues, but have a Multigoiter, and have scans every 6 months, and my PCP sent me to the Endocrinologist, and he found 2 parathyroid adenomas, so then to the ENT for surgery, and they are both following my Thyroid! Hope this helps, Bella1950