I have had 4 treatments, the first and 2nd did nothing, the doctor urged me to continue, the 3rd and 4th gave me some relief for a few weeks which is better then no relief. I go again in a few weeks and I am hoping the 5th time gives me more than a few weeks. Nothing else seems to give me any relief at all.
I tried it twice and it didn't help at all. Personally, I've never heard of anyone with NDPH who was helped by it, thought I've heard of people with other types of headaches who find it helpful. Botox was approved for headache treatments about a year ago. Since then, insurance approval hasn't been a challenge for most people I know who have tried it.