Feeling nauseous after visiting a hill station can be due to altitude changes, motion sickness, or mild digestive upset. To help ease your nausea, try to rest in a comfortable position, stay hydrated with small sips of water or ginger tea, and avoid heavy or spicy foods for a while.

• If nausea persists or worsens, you might consider an antiemetic medication like domperidone, but only under a doctor's prescription and guidance.
• Avoid self-medicating, especially if you have other health conditions or are taking other medicines.
• If you experience severe symptoms such as persistent vomiting, dizziness, difficulty breathing, or chest pain, seek immediate medical attention.

It is best to consult a general physician or a gastroenterologist to evaluate your symptoms and get appropriate treatment. If you want, I can explain more about managing nausea or when to seek urgent care.To narrow down potential causes, we will need some more information.Please tell me your age and gender.