Husband newly diagnosed with metastatic lung cancer

My husband has been diagnosed with lung cancer that his spread to the right side of his brain. He is 52 and we have 3 boys 19, 16 and 12. We are no mans land just now while we wait for immuno history chemistry results to come back to decide on treatment.( which feels like the longest wait of our lives) He is currently on steroids to reduce the swelling in the brain and not sure if it that or just processing the diagnosis but he is all over the place… planning about a million things in one day and spiralling out of control almost. Crazy highs and lows. I just wondered if anyone else had experienced this and how to cope with it. All our emotions are heightened. He won’t sleep for longer than 2 and he needs his rest. It’s awful and so sad I just want to help.