I tis good that you are taking cre of your brother who needs medical care.
firstof all Headche is severe in nature , 1month duration, reduces while he rests /lies down.
Increases ifhe goes to bathroom /or outside. headache is hammering in nature.
How old is your brother/ any precipitating cause?
what did other 2 physicians prescribe or advised ???
I appears to me you need to rule out any raised intracranial pressure/ check optic undus// and Hyperstension if any-
you better get examied with a neurologist
and get an opinion. and rule out other causes of headache- dental, sinusitis/ tension headace/ migraine/ any SOL??/
does he vomit or has nausea?/
does walk normal or he has unstable gait?
once all these questions are answer we can start him on appropriate management plan.
Please get these things done first.