I could try...you're right though, a divorce would be rash. It was also cause unwanted attention, and the fact that in this era there aren't any documents to prove or disprove their marriage.
But several things need to happen, you need to calm down as you'll do neither him or yourself any good in this state. It's true, Katherine needs time to adjust, as we all have. But it's also true that this needs to be discussed between you and her, after she's settled.