Many thanks for all the replies a few weeks ago.
My GP ok'd further testing and has conceded that I'm hypothyroid, but 'subclinical' and in no need to take synthetic hormones.
The test also threw up that I'm severely Vit D deficient, which could account for a lot of the fatigue and aches and pains, so I'm on a high-dose supplement for the next 8 weeks before we retest.
Basically I'm happy that they have prescribed me something and if the vitamin d helps me feel better I'm very happy to not be reliant on synthetic hormones for the rest of my life...
But what I would like to know is: can I do anything to boost my thyroid function naturally? Surely there must be SOMETHING I can do. Vitamins, mineral, diet, exercise, etc? Anything to avoid, also?