Tea/coffee+a great book.. outside if weather permits. OR Gaming. OR Kick your stressed self out to a solo walk/run OR group sport or session at the Gym.. sometimes I feel horrible but the enthousiasm of others helps me regain mine. If you have too many thoughts to keep calm.. grab a pen and take it all out on paper. If you hate writing, you can record yourself until you feel more relaxed. You can later read or hear your story and observe it from a different, posed perspective. It will help you make better decisions. Sometimes doing chores turbo style helps - you take out the tension and then you feel better plus your home is comfy ;) OR cook something delicious... healthy dinner, good sleep and more water can help you balance your emotions. When tense I just spend sometime alone.. often in fresh air.. sometimes all I need is hear the tree leaves whisper to relax.