If he is hospitalized, no other doctor except his treating physician can modify his treatment. So keep faith in your doctor. In these days it's difficult to get a bed in hospital. Your patient is lucky enough to get a bed.
The prescription shows steroid and anti coagulant medicines. So the initial treatment is on right path. Outcome will depend on response of treatment. At age 35 , Lung involvement as 18/25 is serious and further deterioration is possible. Hope your brother will recover.
Next Steps
Keep him hospitalized and talk to your doctor.