Hello, I like to request your professional advise and help
Your dad will be definitely of elderly age I think. He has problems with balancing n associated discomfort on the left side of the neck riding a vehicle increases the problem. This probably suggests he has severe cervical spondylosis witChatDoctorpression over the cervical cord. Does he have any radiating pain to the hands? Does he have any episodes of sudden fall/transient visual observations? Kindly consult a good neurosurgeon and not a neurologist.IN the meantime ask your dad to wear a hard cervical collar when he is sitting or standing n remove it only when he lies down on bed. If he has severe pain ask him to take tab solo 650 mg when he has severe pain n consult a neurosurgeon