First of all, relax. You'll probably be back to normal in a day or two, and don't really need to take a laxative (or to make promises to a bunch of strangers on the internet that you'll never eat something again.)
You could try drinking a cup or two of black coffee, though.
Edit: Cheese can have a constipating effect, but it's also possible that it's actually your recent shift to a "total carnivore" diet that's causing your problem. The fact that you've also recently eaten some cheese might be a coincidence.