I'm sorry to hear that you're experiencing severe dizziness and nausea. These symptoms, especially when they prevent you from standing or walking, can indicate a serious condition that requires immediate medical attention.

What you should do:

• Seek emergency medical care immediately. Call the emergency number provided or go to the nearest emergency room as soon as possible.
• Avoid trying to stand or walk alone to prevent falls and injuries.
• If you have someone with you, ask them to assist you in getting medical help.

These symptoms could be related to various causes, including inner ear problems, neurological issues, or other serious conditions that need prompt evaluation by a specialist such as a neurologist or an ear, nose, and throat (ENT) doctor.

Please do not delay in seeking professional medical care. Your safety and health are the top priority.To narrow down potential causes, we will need some more information.I understand you've been feeling dizzy for over 12 hours, and the dizziness and nausea are so bad that you can't stand or walk. To better assist you, could you please tell me your age and gender?