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As you already probably know, labyrinthitis is caused by inflammation and swelling in your inner ear. During labyrinthitis, parts of the inner ear become irritated and inflamed which causes dizziness (also known as vertigo) and problems with balance.
There are several causes of labyrininthitis, with the most common being anything from ear infection to upper respiratory disease to allergies to a tumor in the middle ear. You already had an MRI which, from what I understand, ruled out a tumor.
Very often symptoms of dizziness you are describing will go away spontaneously within a few weeks of starting. Just as quickly as they started, they can go away. Sometimes, as Camille mentioned, you may require medical treatment to speed up the process of dizziness going away.
If you didn't have a recent ear infection, you do not need antibiotics. If you do not have symnptoms of upper respiratory infection or allergies such as runny nose, sneezing, coughing, watery/itchy eyes, then taking antihistamine (for allergies) will not be beneficial.
The most common medicaiton used to treat vertigo (which is a symptom of labyrinthitis) is called Meclizine. It is available over-the-counter in the strength of 25 mg. You can take anything from 12.5 mg twice daily to 25 mg twice daily. It is very important to increase your fluid intake during the times when you have dizziness (unless you have heart failure, then you have to be careful on fluid intake). When the dizziness is at its worse, try to not doing anything which requires a lot of moving around, this will make dizziness worse. Also, very important to avoid sudden position changes, do not try to read when symptoms occur, and avoid bright lights.
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