I saw your post Tony and decided I need to reply.
This is the first I have heard that gaba (neurontin) is being prescribed for post op headache, bu that's by the by... I do know it is prescribed for trigeminal neuralgia pain.
It is also prescribed for other neurological conditions which have left the patient in much pain.
The interesting thing about this drug is that it has been the subject of a number of lawsuits the last couple of years and the manufacturers have paid out quite some big sums of money. If you do a google search you can find some of this. From what I read, it seems that there was a problem with off label use, meaning that the drug was used and is fda approved for epilepsy but then prescribed for other things such as pain....and there was some "funny business" in that.......and i don't think this is the place to get into all the details about that but suffice to say,  it is, from what i have read again, being implicated in a number of areas in patient reaction. I myself was prescribed that for pain (and this was not AN related), but I had to go off it fairly quickly. I know of a number of poeple who have been on it (again not for An, but for pain. ) Some of those people have said it works for them; many others have said no.. citing weight gain, having to titrate up to huge amts of the drug, and not being helped, along with some other symptoms, some of which are being cited in a lawsuit filed this year. Personally I would not take it ever again. But each of us reacts to drugs differently.
I do know that another drug is prescribed for trigeminal and that is tegretol. I have never taken that so i can't really comment on it, but I have a dear friend who did/is... again this was not for an An or any complications like trigeminal pain but for another neurological condition that is way up there on the pain scale. He has to have his liver monitored while on it..... but it works for him.
If I were you, I would do a bunch of searches on this drug and ask your doctor about what is else is out there for you..... there are others.
Sincerely,
Windsong.