I'm sorry to hear this awful news. I too was recently told my T3 had been blacklisted and so wasn't to be prescribed any more.
Your GP can appeal and if he is denied, then you can appeal on the basis that only Amour suits you including any info, test results, literature, anything you think of and ask your GP for all correspondence.
Your local CCG should have forms for individual finance requests for " named patient requests" for any drugs outside of those allowed, and guidance on the application procedures.
I am supporting my appeal (if it is needed) by including genetic testing that shows I am absent of a gene used in the synthesis of thyroid hormones. I also have other medical history evidence to strengthen my claim.
You can also raise a complaint through your NHS but I need to check the procedure myself. Also send copies of all correspondence to your local MP and ask him to help.
I was also told to advise Lynn.firstname.lastname@example.org
Armour should not be refused entirely on the basis of cost as healthcare professionals have a duty of care and decisions should not be made entirely on the basis of cost of the medicine.
Good luck and dont give up. You are entitled to feel well no matter what medication you require.