My husband was just diagnosed with lung cancer..He has a tumour in his left lung which is blocking the airway and giving him issues with breathing...He crashed two weeks after his bronchoscopy and we had to go for our first chemo session..It was a very intense experience..He is back home after two days after chemo and he is needing an oxygen concentrator to breathe as his oxygen saturation drops without it..He is also extremely weak and has swollen feet..Is this something normal as I am getting very worried?