Tell the endo about the radiation - there is a correlation between that and thyroid cancer. What did the ultrasound say (besides solid)? Any calcification, increased vascularization, complex nodules?? With the solid nodules, lymph node involvement, and history of radiation as a teenager, please don't let your endocrinologist just "pooh-pooh" it.
While you are waiting for endo, I would go to the PCP and have him check out the lymph glands. You might have some kind of infection that has nothing to do with the thyroid and could become worse. Just my suggestion.