Do this little visualization technique, guaranteed to bring you back to being grounded:
Take 3 deep inhalations through your nose and 3 deep exhalations through your mouth, breathing in relaxation and exhaling stress and tension. Now imagine a root growing from the base of your spine. Visualize this root growing down through the room, through the floor, and into the ground; see this root growing deep into the center of the earth. Allow this root to grow thicker while mother earth grabs a hold of it, securing it to her core. Continue to inhale relaxation and exhale stress and tension. Now feel loving energy coming into your body through your root. Mother earth is sending back to you, all of the loving and healing energy of the earth.
Just do this for a few moments, then go back to whatever it is your were doing, and see how very different your energy feels. This is a magical little time out for yourself!