"Waiting for my father to be taken seriously"

I have watched my father aged decades before my eyes over the last 3 months. He is in constant pain, had tests after test nothing that has been done has made any difference to his condition. He is a 55 year old man trapped in a 90 year old body. Nobody in cardiology is taking him seriously not even letting him finish his symptoms and worries before sending him away. His quality of life has diminished to nothing. I cannot believe a man is sent home in his condition. He is passed from pillar to post. Even a prescription sends him on a wild goose chase and he is in no physical condition to be running all around town. I am appauled, scared and frustrated. We only lost my mum earlier this year to something that another department in Harrogate missed. I am very worried this is going to happen all over again this year.