I'm sorry to hear that you feel unwell when using your mobile phone in a moving vehicle. Your symptoms—headache, eye pain, and vomiting—are commonly associated with motion sickness or visual-vestibular mismatch caused by focusing on a screen while the body senses movement.

Here are some steps you can try to reduce these symptoms:

• Limit screen use in moving vehicles: Try to avoid using your phone while the vehicle is moving, or keep usage to very short periods.
• Look outside: Focus on the horizon or a stable object outside the vehicle to help your brain reconcile motion signals.
• Sit in the front seat: Sitting where motion is felt less intensely can help reduce symptoms.
• Ensure good ventilation: Fresh air can ease nausea and discomfort.
• Stay hydrated and avoid heavy meals before travel.
• Consider medication: Medicines like those containing dimenhydrinate (available as Gravol tablets) can help prevent or reduce motion sickness symptoms. However, these require a prescription and should be used under a doctor’s guidance.

If these symptoms persist or worsen, it is important to consult a neurologist or an ear, nose, and throat (ENT) specialist to rule out other causes and get appropriate treatment.

Please seek professional medical advice for personalized care.To narrow down potential causes, we will need some more information.Please tell me your age and gender.