Today my doctor was off so I had a locum. He made me a deal - regardless of what the specialist says, if I take another TFT he'd trial me on thyroxine.
Meanwhile after that, my antibodies came back to specialist. she said she's happy for me to start thyroxine too if I am.
So so so happy. Weight lifted off my shoulders.
Thank you all so much for all your advice. Couldn't have done this without you.