That sounds exactly like the thing that ended up with me in an NHS emergency room last year. I had all the treatments that you received, plus a small bottle of Coke to sip to help break it up till it was small enough to fall inside.  Added onto that I  was fed to  check that i could eat afterwards, having had a night in bed to make sure that I was uninjured, then barium x-rays to check the result.

They said that using an endoscope to push or pull the obstruction out wasn't an option, as there is a severe risk of tearing the oesophagus lining

Any idiot can face a crisis - it's day to day living that wears you out.