Can I just say first of all that I know the OP personally, but am not a relative. A debilitating medical condition left her completely bedridden and in desperate need of an amputation, which for whatever reason the NHS have decided not to fund, even though without it she cannot leave the house unless it is by ambulance and she needs 24 hour care. Prior to this she was a student neonatal nurse with a bright future ahead of her, but she had to give up her course due to her condition.
Her family have saved and fundraised over the past year to cover the cost of the operation as they did not have the money to pay the cost of having it done privately, and in the meantime she has been completely bed bound at home, apart from various hospital stays, when required. It has taken some time but they now have saved enough money and have arranged for the operation to go ahead, hopefully in the next few weeks, but unfortunately her health is now failing in other areas. Some of this is because of the prolonged time she has spent bed bound (12 months).
Hopefully after the operation, and with a lengthy recuperation and the right support, she will be able to gain back some independence and quality of life. At the moment she is not getting the support from the NHS that she needs, in terms of hospital care, if they are willing to send her home without ensuring that she can receive any kind of fluids one way or another, they are failing her as a patient. If she continues to be dehydrated and is deemed unfit to withstand the surgery, then her operation will most likely be cancelled / rescheduled, meaning that the cycle of being bedbound-dehydrated-in hospital will continue. You would think in these circumstances, that it is in the NHS's interests to ensure that she is as well as she can be now, ready for her operation, so that in the long term she is less reliant on the NHS? All she wants is to be able to manage her pain more effectively and not be relying on 24 hr care. Obviously it is understood that it will be a long road to recovery, not a quick fix.
The other point to make is that she is relatively young (mid 20s) and I don't know if this may be the reason why the doctor was unnecessarily rude to her, but the remarks about her weight were uncalled for, and PALS do not seem to be assisting either.
To the poster who commented that she has time to post on here whilst in hospital - being online has been her only form of communication with the outside world for the past year, other than immediate family, doctors and hospital staff, and an occasional visit from her best friend (though this is rare as she is more often than not too ill). Hopefully there is someone reading who can offer her some helpful advice