Welcome to HealthcareMagic forum.
As your brother has already had malaria
, there is chance of relapse in him, as the parasite can stay in the body for long and the life cycle may begin all over again, the symptoms do go in favour of malaria and hence it is mandatory to get him admitted , as the blood pressure is also low , this if ignored may lead to complications like shock
, and many other imbalances in the body
It is wise to follow the doctor's advice and meanwhile let him continue the medicines as advised.
Wishing you good health