Hello,
Thank you for your query at DoctorSpring.com
You are suffering from giddiness for one month. You also have intermittent ringing of ear.
Giddiness or spinning sensation can be due to many reasons including related to balance system in ear, or brain or metabolic causes ( high sugar or blood pressure) etc.
To treat it we need to get correct diagnosis, to get correct diagnosis I need more information, may need to do some investigation.
Firstly, I would like to know the following details: Is it episodic, or continuous.
Any changes with position change( on turning head, looking upwards, bending).
Any nausea, vomiting.
Any headache, cold, fever.
Also I will recommend that you get a hearing test( audiogram, tympanometry) done.
One of the possibilities could be labryntitis. But most common cause for giddiness is positional vertigo, which can be ruled by positional test, this can be done by a ENT specialist.
With regards to your fear of a brain tumor, if all the above mentioned tests return normal, imaging of brain including MRI/ CT Scan of brain can be done to rule out any tumor or organic pathology. However you should be aware your symptoms are not suggestive of a tumor.
So best is that if you can get a step by step evualation by a physician who is running vertigo clinic.
Hope this helps, feel free to ask further queries.
Best regards

Thank you for the follow up.

With all information you do not have classical positional vertigo. So we need audiological investigation including audiogram, tympanometry, ENG, ECoG. All these will help in getting correct diagnosis, based on result we will decide about imaging.

Hope this helps

Best regards