D.H.
I didn't have it for headaches, I used it for...ahem...other things, but I loved it. So I can at least give you the experience factor. The shots were not painful, there was a weird crackling noise and I had no side effects other than the usuall puffiness for a few days. i metabolize meds quickly, so it lasted for only a few months, but I loved it. As far as headaches, I spoke with one woman who was there for that treatment and found it very helpful and was treated every 4-5 months with great relief. I hope that gives you a little help.