Hi, my dad was diagnosed with GMB grade 4 in July. He had surgery, then 6 weeks of chemo and radio, 2 weeks later he started showing symptoms of the tumour being back and was put into hospital, they did a second debulk and he is now out of hospital and having 5 days of chemo out of the month and has just started his second course. It is a horrible disease, my dad has also cannot drive or do much physically and like your dad finds it very frustrating. It is so hard to watch someone who has always been so independant, strong and a conversationalist no longer being able to be that person.