Last year my lung collapsed and i found out that im allergic to: grass, trees, weeds, birds, feathers, cats, dogs, horses, dust mites, molds and cockaroaches. I just want u to see where im coming from by sayin that. For the past 3 months....my chest has been feeling tight and my tonsils have been enlarged. Sometimes i feel sharp pains in my chest and i wheeze when i take a deep breath in. In these two months, i noticed that my period has not come yet. I know im not pregnant ( i took the first response test and it was negative, havent felt sick to my stomach, havent gained weight out of the ordinary, havent had weird cravings for diff foods, havent been real moody). Ive been reading around it says that i might be just stressed and need to unwind and relax. I just want to know what factors are there that can explain this? Ever since last august, ive noticed that my period are coming later and later. And i know im stressing out.....all the time. What can i do it destress?