I'm sorry to hear you're feeling unwell. Nausea combined with a headache and a blood pressure reading of 140/100 mmHg indicates elevated blood pressure, which may require prompt attention.

Here are some steps you can take:

• Monitor your symptoms closely: If you experience severe headache, chest pain, shortness of breath, vision changes, weakness, or confusion, seek emergency medical care immediately.
• Rest in a calm environment: Sit or lie down comfortably and avoid sudden movements.
• Avoid any self-medication without consulting a doctor: Some anti-nausea medications exist, but they should only be taken under medical advice.
• Control your blood pressure: If you have a history of hypertension and are on medication, take your prescribed dose. If not, avoid salty foods and caffeine until you see a doctor.
• Stay hydrated: Sip water slowly to avoid worsening nausea.

Given your elevated blood pressure and symptoms, it is important to consult a cardiologist or a general physician promptly for a thorough evaluation and appropriate treatment.

If symptoms worsen or you feel very unwell, please call emergency services immediately at Apollo Emergency - 1066.To narrow down potential causes, we will need some more information.Please tell me your age and gender.