Signs the cancer may be back

By accident a nodule was found on my thyroid back in March 2023. Had scans, biopsy, etc. to find out it was possible Hurthle cell adenoma or carcinoma. I had a total thyroidectomy on June 27, 2023, and found out it was a minimally invasive Hurthle (Oncocytic) Cell Carcinoma once they took the thyroid out and tested the tissue. That was June 27, 2023. In addition to that I had a small spot or two on my lungs that they've been watching, liver cysts, pain in my hip, lower back and neck. I have been seeing the doc every three months. In December 2023 while back at Mayo, the doctor said there is some regrowth or tissue of some sort showing on the CT Scan, (maybe scar tissue?), but it is too small to do anything with, and a new spot on the lung, again too small to do anything with. I am scheduled to go back to Mayo next week for a biopsy of the tissue in the thyroid bed, a CT of my chest, blood work, and an ultrasound. In the past few days I have started to feel extremely tired, have a strange dry, lumpiness in my throat and my right gland on my neck is very swollen with a lot of neck pain, have a cough and I'm clearing my throat a lot. It feels different than being sick with a virus or something like that. I am curious if anyone has experienced this and if these are potential signs that the cancer is back? Thank you for your insight!