Welcome in H.C.M. for query.
I read your query regarding right sided headache along with whooshing sound in right ear.You are a diagnosed case of type 2 diabetes
Considering above facts and your symptoms it appears as you are most probably suffering from diabetic neuropathy
and diabetic labyrinthitis
Your doctor had advised MRI of brain, you please follow this because here it becomes necessary to rule out any lesion in brain as you have got a family history of brain tumor