Awww, Britt, sorry you are having such a bad morning. There's not much really I can say that will help your situation, but just know we are here for you!
At least your FI only saw a few outfits. Dont worry, he will still be blown away by the pictures. Maybe he just thinks that is your honeymoon lingere :~) I'm sure he feels pretty bad. I second the buying a padlock idea or is there someone elses house you would feel comfortable keeping some of your stuff at?
Let us know how things work out with your mom.