So you had RAI done to kill your thyroid? Correct? If so you MOST definetley need thyroid medication and you will for life. You no longer have a thryoid if they killed it all.
Please go see another doctor if you can.....that nurse sounds like she has no idea what she is doing. When you make an appt. (make sure you get copies of your medical records), tell them you had RAI done on the thyroid & you need lab work done.
Get it done ASAP...
It sounds like you had the RAI done but that it did not kill the thyroid completely. If this is the case, you may not need meds. The symptoms you are explaining sound a lot like hyper symptoms still. What exactly were your levels? You should always ask for copies of your blood test results.
I'd find another doctor who can take you earlier if possible, and definitely one who is willing to listen and work with you until YOU feel better. They work for you, it's their job.