Adria, in all this please take one thing from me. Please do not use the term "trigger" for things that make you angry or uncomfortable or sad. Triggers are powerful psychological events, things that make people near-catatonic, unable to act, have physical and psychological repercussions. A rape survivor, a soldier or police officer or survivor of domestic abuse won't smile, snap a picture, and use their significant power to shame someone if "triggered". Quite in the contrary. Your use of the word sets the stage for people to presume that someone who has a trigger could have "discussed it out" as you could have done. And that is demeaning and dangerous to everyone who really has psychological triggers.
I'd argue that in some cases there's a degree of control that can be developed, but also that this seems to be more the case for sensory triggers than for psychological ones.
