My ward is choking to the point that she is unable to eat or drink anymore. Any advice?

I believed it is not dementia related. I have been a registered carer for a friends grandmother who has dementia and has reached the grand age of ninety and i have been looking after her for nearly five years. Several moths ago she started to cough and had problems with swallowing food but it was spasmodic, but sadly it got worse, on numerous occasions i asked the old ladies daughter to report this to her doctor eventually she did. The reply was negative and less than professional which upset the daughter who then was reluctant to pursue the problem any further, unbeknown to me as i was maintaining my stance on seeking medical advise. Finally she told me to ring the doctor myself, i promptly got an appointment for the following day, as was expected the examination was less than satisfactory and i didn't believe the explanation given by her doctor for the choking problems of this old lady. Three days later i spoke to Freda and ask her if she would like to go to hospital A & E to be examined and to ask for a second opinion of which she nodded yes i also explained that she might have to have something down the back of her throat again she agreed and is & was totally aware of what was being said " I must say the B R I was excellent in their approach and concern for this old lady". The doctor asked why it had taken so long to get to this point in bring her to the hospital, and yes he believed there is a problem or an obstruction preventing Freda from eating and drinking, this conclusion was baste on the fact the Freda answered his question with a full sentence and was completely alert to what was happening to her she also gave her full date of birth when asked in different departments,during examinations i also explained that we go for a walk regularly around the park with Freda pushing her own wheel chair which aids as a support for her, the doctor at the B R I concluded the Freda was in excellent health for her age except this one problem and wanted to admit her to hospital the same day. Unfortunately this was a little bit to much for Freda so i had to decline for fear of frightening her to much "Of which i now regret" So back to her local GP of which i would have liked to replace with another GP but on ringing the local surgery was told that Freda GP was not available today and another doctor was standing in for a ring back to discuss the way forward. well what a surprise when Freda's own doctor returned the call, so i then proceed to explain that we went for a second opinion and the B R I believes there is something wrong with the old ladies throat. Obviously the GP had not read the report sent to her by the B R I and again proved to be rude and very unprofessional towards myself, whereupon she refused to discuss it any further and wanted to speak with the daughter so i duly gave her the mobile no: and put the phone down. About an hour later Maria returned home and told me the doctor had contacted her , having discussed Freda's daily activities the GP must have now realized that Freda is not in the advanced stages of dementia as she had first thought, her reason for thinking she was is Freda does not respond very well when in the presence of her doctor. And now the outcome, the gp suggested that Freda have an endoscopy or a barium meal at the hospital , so Maria decided on a barium meal, when i donot know as we are back in the doctors hands so this may be weeks away before the appointment,not idea when you can no longer eat or drink properly also i'm afraid that either course is now not suitable for this old lady as it can take upto 2 hrs plus just to drink a glass of water. So please can someone advise on my next course of action to save this old lady from further suffering and very sad to say but certain death if this is not resolved quickly.