The right meditation is the one that works for you at the moment.
You may find it hard to stay focused at first which is normal. It takes a bit of practice. In a short time you will be able to do a short meditation most anywhere you find yourself. You will return to the task at hand refreshed.
Meditations like these have been used for centuries by many practitioners, therapist, religious leaders and physicians.
Mantra meditation:
Select a one or two syllable word. Sit comfortably, close your eyes. Calm your mind. Take 3 deep breaths and repeat the sound you have chosen over and over allowing the sound to resonate within you and in rhythm with your heart beat.
Breathing meditation:
Sit comfortably, close your eyes. Calm your mind. Focus on your breathing - in and out, Breath slowly, deeply at a steady pace. If thoughts enter your mind acknowledge them and let them drift away.
Candle meditation:
Darken the room. Sit comfortably. Light a candle with a flame-proof dish underneath it and place it at eye level in a safe place. Calm your mind. With your eyes partially closed, focus on the flame. Watch the colors of the flame. Breath slowly, deeply at a steady pace. If thoughts enter your mind acknowledge them and let them drift away.