Sorry to hear this OP. We had similar twenty years ago with my dad. The GP wasn't able to help and my Mum couldn't cope. The hospice was fantastic - but might not be right for your situation.
The state or role of GP surgeries is a separate question and there are many factors in play. Too many people, (they are building 1000 houses in the field opposite me - No new GP surgery, no school, no more roads - nothing.)
New and increased demands on the GP including sick notes, MH services. preventative programmes, budgets and tenders.
Change in the way GPs are treated by their patients, (less respect, more complaints and demands - whether justified or not is not the question at the moment but the impact on the service GPs offer is evident).
GPs don't want to do it any more - it's pretty thankless.
So for the OP - she's had some good advice, (and I really hope she gets help or maybe respite care where the symptoms can be managed properly, because what she's going through is hell).
The wider issue about GPs needs a total rethink - but that's not going to come any time soon.