Most of us would like to have some control over our instantaneous emotions. However, we observe that it is extremely difficult to control your emotions. One can only channelize the energy of an emotion, but one cannot control the rise of the emotion itself. However, emotions and breathing are directly related and this link has been continuously observed in a lot of research. Therefore, it is seen that one can gain control on emotions by breathing in a specific manner.
Refer the below link for a complete understanding of how breathing affects our emotions.