Last night stress, why today am i "physically" a mess? diarrhea tired anxiety. don't understand why it always affects me the next day?

Adrenaline: Stressful events can cause a surge/release of adrenaline into the body. Often times, the resulting fatigue, anxiety, and even diarrhea can be the side effects experienced from this release, even the next day. Develop a concrete plan for handling stressful events. Recognize that your body responds this way and perhaps change your level of reaction to stressful events.