How Often Can Meclizine Be Taken?

I am a 66 year old woman, have A-Fib, and am experiencing a “whizzing” sound in my ear. My left ear is somewhat stopped up 90% of the time. I have been diagnosed with “labrynthitis viral syndrome” 35-40 years ago. At that time, I was prescribed Meclizine 10 mg but only took it when I began to get dizzy (4-6 times/year). Episodes began to increase in frequency to 2-3 times per quarter. Between 8 and 10 years later, 10mg was not helping. Anticedents were a loud sudden sound, bright light, or whenever my digestive track was irritated. I was then prescribed 25mg that I only took when I needed it. During the last few weeks, I have had to take meclizine more often with a frequency gradually building up to a need of every 4-5 hours as opposed to every 8 hours. QUESTION: How often can I take meclizine without it hurting my body?