Woman are moody and more emotional than men. Its your job as her husband to not get caught up in her energy( triggered as you say). Husbands should be emotionally stable and have a calming effect when his wife gets irritated. Its not easy but with practice you can do it and you will be rewarded with a stronger marriage as you get better at it.

Often times woman like to vent. They don't want advice and they don't want you to try and fix things. Only you being there and listening is enough. The worst thing you can do is fall into her negative energy. Sit there quietly and listen. Every time you feel the urge to speak, let her continue. Or ask a leading question or say tell me more. Do this several times and let her get everything out then tell her its all gonna be ok.