Sorry, as an aside. One Gabapentin made it feel as though my head had split open and my eyes swelled up and bulged out of my head. I ended up in AandE. No more drugs of that family for me.
My TN, as with the Cluster Headaches I suffer from, is Chronic. I get no respite, no breaks, and the Parasthesia all over the left side of my head and face is 24/7.

Dave.