HIPAA-Compliant Patient Anonymization Pivot Table Macro

Design a Google Apps Script macro that automatically anonymizes patient data in a spreadsheet while preserving statistical integrity. The script must: 1) Replace personally identifiable information with randomized tokens, 2) Maintain referential consistency across multiple sheets, 3) Generate an encrypted key mapping for potential future de-anonymization by authorized personnel, and 4) Implement AES-256 encryption for sensitive columns. Include error handling for different data types and comprehensive logging of anonymization processes.