Ask to see your labs so you at least know what has been tested. If she's only tested for TSH, ask her if she could be willing to order a the appropriate tests for Free T3, Free T4 and for antibodies (there are several panels that would need to be run). Of course, she may not know how to intepret your results, so I'm not sure where that will get you. If nothing else, discuss these tests with your endo.

Here is a link that might help you better understand why it's important to test more than just TSH and why, even when TSH is normal, there may be something else going on, e.g., an automimmune disease.

I'll admit that I've had my own frustration when it comes to getting appropriate testing from my endo. Just because they're an endo doesn't mean that they get thyroid disease any better than a GP. So, if you get resistance or he/she isn't willing to explain things to you, get a second opinion. That's sort of where I've been for a while myself.