You can find the doctors here : http://www.thyroiddoctors.com/ It is always nice to have a functional medicine doctor.
Your TSH is low, but how are your other results? How do you feel lately? Do you feel hyper?
It's not unusual for TSH to be suppressed when taking thyroid hormones, but many doctors panic when they see it... I'm having the same trouble, now that my endo has left private practice.
What are the exact results of your FT3 and FT4? What dosage of NatureThroid are you on?
Taking T3 medication prior to a blood test will give you a false high result. It won't make a lot of difference on the FT4, T4 med has a long half life and it takes a long time for that to build in your system.
If you'll tell us what city you're in, perhaps we have a patient recommended doctor in your area. If you don't want to put it on the open forum, that's fine, you can send it to me via private message. To do that, hover your mouse over my name and you'll get a drop down box, then click on "Send a Message"... Also let me know how far you'd be willing to travel and whether your insurance require you to have a referral to a specialist.
Be sure to include reference ranges when posting lab results, since ranges vary lab to lab and have to come from your own reports.
I'm sorry to be so persistent, but simply telling us that your FT3 and FT4 are "bottom of the range" doesn't help at all. If you have the results, with reference ranges, we'd be able to help much better.
Both, low FT4 and low FT3 doesn't mean you weren't converting. If FT4 is too low, there's simply nothing "to" convert...this is where actual results come in, so we can provide better help.