One way to strengthen and control your empathy is by meditative gazing. Candle gazing, water gazing, even scrying--gazing at yourself in a mirror.
Candle Gazing/Fire Gazing: The technique is simple. Dim the lights, turn on some meditative music or ambience, and light a candle at or below eye level. Focus on the flame. Rest your mind. Breath evenly. After a time, your peripheral vision will fade, and all you will see is the flame before you.
Water Gazing: find a bowl with no design or text at the bottom. Fill it with water. Set your mood as you would with candle gazing. Focus on the water. Rest your mind. Breath evenly. After a time, your peripheral vision will fade, and all you will see is the water before you.
Mirror Gazing/Scrying: find a mirror, and place is at eye level. Set the mood. Make sure you can see your eyes clearly. Get as close as you can to the reflection without straining your eyes to focus. Stare into your eyes until your peripheral vision fades and all you can see is your eyes.
How Does It Work? If these techniques are practiced regularly, they hone and develop your concentration. Your mind is brought to a place of stillness, which helps you regain focus. Every day, you mind is inundated with images and perceptions that tire your mind, making it difficult for the average person to understand their own emotions. You can imagine why it would be that much more difficult for empaths!