I understand your concern towards your brother. He seems to be suffering from anxiety symptoms including scary dreams. More clarity is needed regarding his actual problem. However it is easily manageable with appropriate treatment. Some counselling sessions and if needed medical help might be useful for him. I would also be more than happy to help you with that if you are looking for further online assistance. Discussions will be held confidential. You can directly consult with me through Practo as needed. Online chat consultation is available.