Re: Does this sound like a cause for concern?
You really should have an MRI. The sneezing, jumping and bowel movements all increase intracranial pressure, which is triggering the headaches. Daily headaches are not normal, plus the symptoms seem to be increasing over time. Please see a Dr and ask for an MRI, and if they won't order it, see another one until you get it done. An MRA would be even better as that shows up the vessels in brain for vascular anomalies.