Afraid

Hey ,my hubby is diagnosed with a brain tumour last week just one year after he was diagnosed with lung cancer he finished his treatment for his lung cancer on the end of May and had a scan in September and all was looking ok the tumour was shrinking and he was feeling better but now he is confused worried sick and both of us don't know or we are coming or going .He got his MRI scan yesterday I can't find the wright words ,I feel so helpless .why did it spread so quickly after he had a very heavy chemotherapy and radiotherapy and what is the next step and can the cancer have spread to other parts of his body we don't know what to think and we so afraid