Nortriptyline
"Have taken 4-5 years now changed my life for the better.  A neurologist I saw for over 25 years treated me with 4-5 drugs.  The last 15 years prescribed Demerol 100 mg liquid injections.  My headaches were 4-5 week.  I left that doctor went to my primary who prescribed Nortriptyline 25 Mg 1 pill before going to bed.  That has worked so well I don't have but maybe 4-5 headaches a year now!!"