I never want to cry but if I do I "give it up" and just let it happen but keep concentrating on what I'm working on and saying. My husband started laughing (kindly) once because I was earnestly still talking, tears pouring, and he found it less frustrating than dealing with his first wife who would be all tears and being upset and "stop" everything else, even before the other person could understand what was upsetting or anything much at all. I just keep plowing forward once I "lose" that wall around me.