Pt on medications for BP taking radiation treatment for lung cancer. Pt pre treatment had a few incidents with numbing of arm and legs buckling. Seems to black-out or almost black out, not remembering going down but remembers how he felt prior to the falling to knees. What should he tell his Dr to get them to listen. Cardiograms normal, Brain scan normal. He is 4 months post smoking and alcohol consumption. Dr say may be treatment related but since happened before I feel they are wrong. Please help