((((((Taffy)))))) I would say 5 yrs is a pretty good trial run. Something else may just do the trick. What does Doc say, besides Duhhhh?
I'm surprised you've put up with headaches this long...not funny. I think our Neuros sometimes scare us into thinking, that if stop our DMD, our MS will take off like a runaway freight train. Not true except I have heard that stopping Tysabri may have that effect.
Grab your Doc by the **** collar and demand something new better and different. Let us now how that goes.