yes, i had this problem once, but it was definately my own stupid fault. after a day of not washing my hands, i ate a really messy sandwich, and then proceeded to attempt to make ety plugs out of some earplugs i had lying about. this involved much handling of said earplugs, and insertion/removal/reinsertion. that night i started getting a terrible ringing in one of my ears, and when i went to the health center the next day, sure enough, it was an ear infection. you should get it checked out.
its better to catch them earlier rather than later, or else you'll be in considerable discomfort for a while after you start taking antibiotics.
oh, btw, are you feeling dizzy, disoriented?