My father has just been diagnosed aged 82 with grade 4 glioblastoma. It’s devastating to see how quickly he has deteriorated. Mood deterioration and visual impairment. 
Seeing the person you love so much suffer and have so little option is agony. 

Think with the elderly , some symptoms can be seen as dementia or cataracts. Never occurred to be he has a brain tumour. 
Am struggling.