roaring in the ear is known as Tinnitus,Tinnitus is a subjective feeling ,in which patient seems hearing a hissing roaring sort of noise. Tinnitus itself is not a disease but its a symptom it can be because of either circulatory problem or age related ,inner ear injuries or it can be idiopathic(cause unknown) as you say sometimes you feel dizzy also ,our ear has three parts outer ,middle and inner inner ear is involved in hearing and maintaining balance of the body As you feel tinnitus and dizziness also most likely your inner ea is envolved there are many condition which may cause this anaemia vestibular neuritis menieres disease any injury to inner ear you have not mentioned your age i would suggest you to go for -pure tone audiometry test -complete hemogram -a physical examination for nystagmus is to be done to rule out vestibular neuritis(as a high dose methyl prednisolone therapy will be given if it is suspected) till that time i will suggest you to take tablet ginkocer(extracts of ginko biloba ) leaves thrice daily for dizziness you can take tablet betahistine 8mg twice daily for few days but in many cases timnitus remains idiopathic and is still a topic of research of many medical fraternities!!!