Thank you for posting your query.
First of all, let me reassure you that your mother would not develop a blood clot in the brain, three years after a head injury
The current pain is unrelated to the accident earlier.
She can take pain killers such as ibuprofen
tablets now. If symptoms persist, please get her checked by a doctor.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist