Whats the technologies used to Diagnostic Neurological pain?

These constant headaches am getting are called false by some of my family members, so i just wanna prove them am actually having these headaches(They’re stubborn as hell and bit dimmed minded) I saw in Grey’s Anatomy that they used some imaging diagnostic tool to determine a guy’s constant headache for 8 years, mine has been for 4 so please i need help to identify my problem.
I did see a neurologist, he gave me meds for the headaches 6 months ago but its still there.