For the passed few days, I ve been getting a terrible cough , at a certain time. Around 12:30, after my lunch period at school, as I m in class, out of nowhere a very bad cough comes & it lasts for a few minutes. It s terrible, I need to walk out of class & wait until it s done, & as soon as I relax it comes back for a little longer.. Any reasons why? I find it strange how it s the same cough at the same time, everyday.