Be careful, messing up with one of those can result in chronic migraines which can be much worse then fibromyalgia. (your "ultimate pain point" idea is a bit iffy, there is a lot worse out there then fibromyalgia)

I have been looking at designing an implementation of open eeg and transcranial stimulation is filed under "what happens if I mess up the wiring" and I am lucky that I already have chronic migraines so this risk is mitigated (all I have to worry about is temporary blindness)