I’d vote for the neurologist. They have a more general training/expertise in neurologic problems, and the “sensation of confusion” issue is more worrisome, along with the headache. Most likely, both would consider ordering a CT scan or MRI if the symptoms sounded severe enough, but a neurologist would be better suited to do a more thorough initial evaluation. Just so you know, brain tumors are rather rare, so, although people do worry about them, the chances are low. All of this could be related to your music career, as you suspect, and you might benefit from a formal hearing evaluation as well.