Your brother seems to be indeed suffering from depression from the symptoms you have mentioned. However more clarity is needed regarding his actual problem. I would be more than happy to help him come out of it. Some counselling and if needed medical help might be needed for him.
Next Steps
Your brother will benefit from a psychiatric consultation. You can directly consult with me through Practo. Online chat consultation is available.
Health Tips
If suicidal, please seek immediate professional assistance.