Gabapentin
"I started having headaches, pressure, and a hangover like feeling in the mornings about a year ago.  In early December 2014 I was diagnosed with migraines which were causing my issues.  My neurologist put me on 300mg of gabapentin and I felt great from 12/5-12/20. I started getting the morning hangover feeling again on 12/21.  My neurologist is now upping the dosage, hope it gets me back to that point/place."