Hello,stress can have a number of unpleasant effects, like headaches, weight gain, acne and other skin issues — and it can also affect your period. When you're under physical or emotional stress, your body produces the stress hormones adrenaline and cortisol. Elevated levels force the brain to decide which bodily functions are essential and which are nonessential until the stressful event is over.You must try to get be stress free, Do yoga ,meditation, listen to music.