Will .25 ativan (lorazepam) help dizziness from labyrinthitis or would i need to take more?

Yes, with caution: Benzodiazepines reduce activity inside your central nervous system. This means your brain is less likely to be affected by the abnormal signals coming from your vestibular system. However, long-term use of benzodiazepines is not recommended because they can be highly addictive if used for long periods. You might need some anti-vertigo med such as proclorperazine.

Speak to your doctor: I'd speak with the doctor who prescribed the Ativan for the labyrinthitis, as the treatment plan should have been created for understanding how you would respond to therapy.