Shingles of the brain is called herpes zoster encephalitis. It is a rare but serious complication. Besides the shingles rash, other symptoms start quickly. They include headaches, vomiting, fever and confusion. Shingles encephalitis is dangerous because it can cause seizures and swelling of the brain.
https://www.healthgrades.com/right-care/shingles/5-complications-of-shingles

