Nortriptyline
"My neurologist put me on nortriptyline  as my common migraine attacks became more frequent, 10 or more a month. These migraines were almost always accompanied by a stiff neck and often woke me up after 5 hours or so of sleep.  Started at 25mg daily, I noticed a change in the pattern.  While previously I would have 3 days of migraine in a row, the migraines were mostly limited to one day.  After a month or so, the dose was increased to 50mg, and I am largely migraine (and stiff-neck) free.   I take it at night, so the only side effect is that I sleep longer than I used to.  My understanding is that after some number of months the dose will be reduced and/or I will be taken off of it to see if the migraines return."