This is a tricky one. Before I went to get help, I was finding it very hard to contain my emotions... though rather than tears, mine was more 'fight' rather than 'flight'. CBT helped me to keep my expressed emotions in check more... if someone said something that triggered me I would just breathe and I would combat the intrusive thoughts. The therapist told me to imagine such thoughts as an annoying parrot sitting on your shoulder and that you had the choice to either listen to it or tell it to shut up.

This still works pretty well in relation to triggers brought on by others... not so much with just plain old negative thoughts... with those I just try to focus on the job at hand or if it becomes unbearable I go and walk around the warehouse then head to the loo and splash my face with water. The change of scenery helps I guess.