Just remember it feeds off of itself. If you let your mind continue to focus on it, the higher it will go. I have the same issue when I check my blood pressure. I know through interaction my bp is good but when think about taking it and the fear of it being high, makes it high. Try to focus on something else and ignore it. A good example is like when you were a kid and your parents insisted on you going to sleep yet you were stubborn and decided you were going to stay up all night, more likely than not you were asleep before you could even realize it.