Do call for help. It could be as relatively innocent as a migraine, but it could be something worse. Eyepressure can be a problem., and eyes can get permanently damaged really fast. (I've had Uveitis, which thankfully went away after 5 weeks of prednisone. But was virtually blind for a couple of days there, and would have gone completely dark permanently if I hadn't put my foot down and gone back to the hospital. Dry eyes, my *ss!). Don't wait it out, call the nhs helpline. Better call for nothing than not eh.