It can be a relief to express negative feelings to colleagues, but try to do so without ruffling feathers or capsizing the boat:
BREATHE BEFORE YOU SPEAK - a couple of deep slow inhalations will calm your system and make you appear less threatening as your facial muscles relax.
DROP YOUR VOICE A TONE and try to speak calmly and slowly. Intense feelings make us prone to squeak or shout.
ACKNOWLEDGE THE PROBLEMS OF OTHERS before stating clearly what you feel.
DON'T BLAME OTHERS for making you feel what you feel. An event can produce different reactions in different people.
FINISH ON A POSITIVE NOTE whenever possible.