I have had several bouts of this, a shot every 2 weeks during a 2 month time. It helped alot but, I became stupid and didn't follow doctors orders of not having other doctors treating me with narcotics. So, now that I am no longer doing the shots, I am back to the same old migraines. So, this is just a short term helper.
If you don't get much feedback here, you might want to come post this in the forum too.
Teri