I recently had a "blip" at my last visit. And I never have had it elevated. Yes, I drink caffiene and before the visit.
Second visit it was still above my norm, but not bad --yet--
But I have since then done a BP in a more relaxed environment (luckily I work at a hospital)...but you can also do it at the local drug store. Do it when you are relaxed and see if that makes a diff. (Not that I am saying don't go to your doc, but maybe check it out to see if it truly is a blip)