JW,
Sorry to hear about your headaches. Yesterday was my 3 year anniverary, and I can assure you that things do get better. I had many headaches for the first year brought on by sneezing, coughing, or just turning my head the wrong way quickly. The headaches diminished so incrementally that I didn't notice it until later on when I remembered how bad the early headaches were. Hopefully you will have the same results. I assume that you are still less than six months which is still early in the full recovery. I also believe that it takes more than a full year for the skull to completely heal from the incision. I can now sneeze, cough, or whatever without retribution!!! So hang in there; good days are ahead.
One funny side note: my kids goaded me into doing a cannonball off the back of the boat that first summer(6 months post op). Don't try it. It took an hour for the headache to subside.................