La dernière émotion que j'ai ressentie. était la

A subordinate clause can't stand alone like this, so I merged both sentences

J'étais triste sse.

Aujourd'hui Ce matin, je me suis (disputée/battue ?) avec mon mari .

This morning = ce matin
"Se battre" is really strong, it means you hit each other. If it was just a vocal quarrel, "se disputer" would be the world.

Et j'ai réalisécompris/je me suis rendu compte que ça n'e s'était pas bien passé bien.

"réaliser" in this sense is an anglicism. Although it's a well-acxepted one, I always suggest more common purely French alternatives
"Se passer", like all reflexive verbs, require the auxiliary "être"
"Se passer" happened before "se rendre compte" = "past in the past", plus-que-parfait => s'était passé
I didn't understand what "ça" referred to exactly: if you meant the fight "ne s'est pas bien passé", it would be tautological since that means "it didn't go well"