EDIT - cross posted with people who have proper advice!
I am really sorry to hear about your experience.
However, I literally do not have the time - and neither do you! - to start explaining the hideous mess that is the NHS and the GP system.
I wish I had more time to reply properly, but ultimately I can't offer a solution so I won't waffle.
But don't try to focus on what's gone wrong at your GP. It is a waste of time.
You can only focus on getting correct treatment.
It looks like the main issue now is getting your thyroid treated?
Were the beta blockers prescribed for anxiety? The current system is set up to dismiss women as either needing mental health medication or something hormonal.
I would suggest that you take someone else with you to the appointment....
But there is also a risk that you will see a non-GP, who will just keep telling you that they haven't got the authority to check this, that, the other, so might not be worth the bother.
Do you have someone to talk to about the situation and make notes so that you have a correct record of the medical status?
I no longer even know what my NHS record says - It is that worthless.
From the several hospital admissions my parents have had over the years.....Staff do generally know that it's worthless and they will come round and ask you questions before procedures.
Thank goodness they do because you were asked that question about the CT scan. Maybe it's worth posting on the general health board about your thyroid questions?