@Twinsie: If your doctor thought it was okay to postpone, I don't think you have anything to worry about. Most thyroid cancer is very slow growing and is actually caught by accident. In fact, most of the time, if you read the other posts on here, after they find the nodule it's a waiting game of ultrasounds and biopsies, often taking several months waiting for results or waiting for something to happen if things are inconclusive. Your case is actually pretty quick from diagnosis to surgery.
@Scottsdale: Glad things went okay with the surgery and the RAI. Personally, I found the info online made things less scary because I understood what was going on and what to expect. I think it depends on what kind of person you are. I like to ask a million questions and not just rely on what the doctor tells me.
If your TSH is 2.3, that's actually in the "normal" range for a "normal" person, but since you have a history of thyroid cancer, your doctor is going to want to keep it lower than that, into the low-normal to beyond low range of TSH. Remember that TSH has an inverse relationship to thyroid hormone. It's your pituitary gland asking for more thyroid hormone. If your TSH is high, you don't have enough thyroid hormone, so you are hypothyroid. If you have too much thyroid hormone, your TSH will be low, making you more hyperthyroid. A normal TSH (depending on what your target is) is called "euthyroid" (pronounced "you-thyroid").
It takes at least two months for your body to adjust to a new thyroid hormone dosage, so be patient in between changes. Also, make sure you are taking your pills at the same time every day, on an empty stomach, at least a half hour to an hour before eating, not within four hours of calcium or iron supplements or antacids. Consistency is key.
If your TSH comes back in the target range and you are having symptoms, please re-post on here with what you are experiencing and we might be able to suggest some things.