Hi. 9 weeks ago my hubby was diagnosed with terminal stage 4 lung cancer which had spread to the brain. He had gamma knife surgery on his brain tumours which was excellent. 2 weeks after that he became very weak. He' in hospital at the moment with pneumonia which he is getting over nicely. He' had 1session of immunotherapy but we just can' cope with the fatigue / weakness. He can hardly walk. The weakness is terrible. Has anyone had this and will it get better. He has had 2 weeks of not even going to bed just laying on sofa. I' welcome any info please .