Yes, that appears to be the case. I'd say that thyca is a low probability, and even if found, it is very treatable. Not to worry. Note the following info I found.
"With the increased use of thyroid ultrasound, some studies suggest that thyroid nodules occur in >50% of the population. Studies report on possibility of thyroid cancer in about 5% of thyroid nodules. Fine needle aspiration biopsy (FNAB) is the best way to find out whether a thyroid nodule is cancerous or benign."
Also, I found this.
"Most thyroid cancers are very curable. In fact, the most common types of thyroid cancer (papillary and follicular thyroid cancer) are the most curable. In younger patients less than 50 years of age, both papillary and follicular cancers have a more than 98% cure rate if treated appropriately."
It is not unusual for nodules to form on the thyroid gland, especially if your Hypothyroidism was caused by Hashimoto's Thyroiditis. These nodules can leak thyroid hormone at a rate that can cause elevated thyroid hormone and resultant hyper symptoms like you are experiencing. I am sure after all this time you are ready for something to be done now. So the doctor is scheduling further tests in order to determine your options.
I am confused by you saying that "all your blood work says hyper", but your "T3 and T4 are normal". When you say you became hyper, is that based on having hyper symptoms, or because of the low TSH? Also, please post your actual T4 and T3 test results and reference ranges shown on the lab report.