It might be anonymous OP, but you started by asking a question and then just got angrier and seemingly more entitled with each post.
This is AIBU and it’s brutal at the best of times, but you’re giving posters more than enough ammunition to tear you to shreds. It’s not just about venting, it’s about listening to the advice given and with each reply you just seem to be doubling down on your unpleasantness. There will be people here who work within the NHS and have to put up with similar shit on a daily basis, and there will also be people who are still waiting for surgery, who are understandably angry at the entitlement of threatening to walk out if you don’t get your own way - and the comment about the amount of tax you pay was unwise to say the least.
You’ve brought the condemnation on yourself. If you’re anxious then ask when you arrive for some sedation to help you cope - for your sake and that of the staff tasked with caring for you.