Funny! It's all going to be fine though, really. I've just returned from a month's visit to the States and I recognise your post-trip fears. I had most of them, none came to pass.
And here's the thing about packing--stopping worrying over it. Just take less than you think you'll need. You probably won't wear most of what you bring. . . so you'll have room in your suitcase to bring back wooden shoes, or tulips and some really fantastic Dutch cookie--kind of a crispy waffle stuck together with caramel. I can never remember the name.
Have fun.