Do you have a copy of the actual ultrasound report? If so, can you post it here, so we can see exactly what they found? Although calcium is sometimes present in cancerous nodules, it isn't always a bad thing. It would depend on other characteristics of your thyroid tissue.
By ordering a CT on top of a "normal" ultrasound, it's unlikely they're going to be missing anything.
I do agree with gimel, though - TSH is not a useful test, except in the case of overt hypo/hyperthyroidism. You need to have actual hormone levels (Free T4/Free T3) tested. It would also be beneficial to test thyroid antibodies in order to rule out (or confirm) Hashimoto's or Graves Disease. Talk to your doctor and if s/he refuses to do any/all of those tests, it might be time to find a new doctor.
The only time TSH is useful as a diagnostic of thyroid status is when it is at extreme levels indicative of overt
hypo or hyperthyroidism. What was your TSH level shown on the lab report? To get a better picture of your status, you need to be tested for the actual thyroid hormones, Free T4 and Free T3.