Hi, @amm97. Another piece of your medical mystery might be unfolding. From research, over 95% of thyroid nodules are not cancerous and don’t create any issues. However, some nodules can stir up a little trouble with either an under production of thyroid hormones, called Hypothyroism, or an over production of additional thyroxine and create symtoms of hyperthyroidism.
They include a number of the same symptoms you’ve been experiencing such as: Unexplained weight loss
Increased sweating
Tremor
Nervousness
Rapid or irregular heartbeat
According to the Mayo Clinic website:
https://www.mayoclinic.org/diseases-conditions/thyroid-nodules/symptoms-causes/syc-20355262
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Two other credible sources to let you know this type of nodule is pretty common.
https://my.clevelandclinic.org/health/diseases/13121-thyroid-nodule
Another reassuring article from John Hopkins: https://www.hopkinsmedicine.org/health/conditions-and-diseases/thyroid-nodules-when-to-worry

This article is also really interesting. Hyperthyroidism can also cause swollen lymph nodes which, again, may explain some of your sympotms. This article really has a long laundry lists of side effects.
https://thelymphnodes.com/related-health-issues/hyperthyroidism/#:~:text=Hyperthyroidism%20is%20a%20condition%20where%20the%20thyroid%20releases,this%20thyroid%20disorder%20can%20include%20swollen%20lymph%20nodes.
Give your doctor time to evaluate the information you received on your portal today. She may just be onto something after seeing the CT results. This gives her another piece of the puzzle. ☺️