Hi, my Dad was diagnosed with prostate cancer in February it has spread to his bones in his pelvis and the clivall bone in his head, he is on hormone tablets and injections but he also had five sessions of radiotherapy about 5 weeks ago. He is now feeling very sick all the time and is not eating, he sleeps most of the day and is very weak. Could this be the radiotherapy or is it more likely the cancer has spread? He has had more scans today. He is 77.