He needs to come to terms with not being allowed to work due to physical reasons. It's probably making him very depressed. Maybe he should see a T to help him deal with it. He will need to find something else to keep himself occupied though. It's not good physically, emotionally or mentally to not do anything. And it's probably not helping the depression either.

Like the others have said - look after yourself first. There's no use in you burning yourself out too.