Just let it release, cry if you have to and seek out a Bach flower remedy to help with the emotional level. Rescue Remedy is also great. The more you clear the blockages the quicker it will cease to be. These are quite common in both men and women. It has to do with the energy flowing too quickly through the body, hormonal changes, which men have too, and the body adjusting to the higher vibratory rate.
Some men even grow breasts, or have an enlarged chest area for a while.
You will however have a little puffiness in the chest area for a short while. As the higher vibratory rate enters your body, the force of it will be so strong that many people feel the effect of it in the physical body in the form of aches and pains in the muscles and joints. Asking the Higher Source for help in removing this pain will help a great deal. Once the body gets used to the higher vibration it will settle down and then the energy coming in will be no further problem. This sensation can be frightening because you may think you are having a heart attack.