Began nov 20th: headache fatigue. 21st nausea vomiting headache dizziness body aches and hallucination last night. Today nausea headache and diarrhea.?

May be an infection. You should call your doctor right away or consider going to the er or urgent care. You may have a viral syndrome or viral meningitis which is a viral infection which can cause these symptoms and much less likely a bacterial infection.