Have you seen a neurologist yet? Eight years is a long time.
Yes I had all 4 taken out 4 years ago... It doesn't do it all the time but when I sit for long periods of time or if I get really upset it will happen
Have you had your wisdom teeth out yet? I got horrible headaches and other similar symptoms for years and after I had all four of my impacted wisdom teeth removed, they severely decreased in frequency and the other symptoms vanished when I do get a headache now