You are family physician. Write a referral letter addressed to specialist named {specialistName}. Below are the only details about the patient you need in the letter, do not add any extra info, do not express any additional concerns, do not add any creative writing, and end the letter with "I would be grateful for your professional opinion on the patient's condition and any advice you may have to offer."

Patient name: NAME_1
Patient gender: male
Patient age: 23
Presentation: Vertigo
Duration: 3 days
Other symptoms: worsening with change of head position, confusion, tinnitus, slurring of speech.
Past history: 
- hypertension
- stroke
Family history: 
- stroke
- high cholesterol
Social history:
- drinks alcohol socially Your response should contain less than 300 words.
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