The specifics of your situation may be subject to local laws and regulations, so it's essential to consult with a legal professional to get accurate advice tailored to your circumstances.
HIPAA (Health Insurance Portability and Accountability Act) is a U.S. federal law that protects the privacy and security of an individual's health information held by covered entities, such as healthcare providers, health plans, and healthcare clearinghouses. HIPAA generally does not apply to employers or co-workers, as they are not considered covered entities under the law.
However, other laws and regulations may protect your personal information and privacy rights in a workplace setting, depending on your country and region. For example, there may be laws related to data protection, confidentiality, or employee rights that could apply to your situation.
Using pages stolen from your journal without your consent could potentially be a violation of your privacy rights or could be considered unethical behavior in the workplace. If you believe that your co-worker is using stolen information to harm you at work, it's crucial to document any instances of this behavior and consider speaking with a supervisor, human resources, or seeking legal advice to understand your options and protect your rights.
Remember, consulting with a legal professional familiar with the laws in your jurisdiction will provide you with the most accurate and relevant guidance.