Reducing feelings and words so as “not to trigger an argument” can in fact cause you much more stress and anxiety than simply having it out straight. The even more you avoid saying with your partner, i.e. subdue your negative feelings, the a lot more your anxiety degrees increase.
High degrees of tension can cause headaches as well as influence the high quality of your sleep. Why destroying your psychological as well as physical well-being when you can just let all your negative feelings out.