I've just been to see an Nutritionist and am starting my "journey" to improve my Thyroid function. She talked about how taking Thyroxine on it's own may not be the whole answer as your body may be unable to convert TSH to T3/T4, so while your TSH may be normal, your body may not be using it effectively. She has recommended a number of suppliments which will help support my adrenal functions, improve my energy levels and help my body process food more effectively and help with weight loss. I will be also following a diet which excludes dairy and wheat and includes lots of high vitamin and mineral foods.
Nutrition and supplements can be used to support conventional drug therapy, but are not always successful on their own. Also, once you have started on Thyroxine, it is unlikely (dangerous) that you can stop as the drug takes over from the Thyroid.
I've got alot of reading to do but she has suggested:
Adrenal Fatigue, by Wilson Why am I so tired and The Thyroid Scandal
I'd love to hear from others who have had success (or otherwise).