Check your nearest Polish grocery store. I bought something Polish, that I'm reasonable sure is cream-of-wheatey.
You could also check for something along those lines at any whole foods/health foods shop. Even if they don't have cream of wheat, they'll most likely have fine-ground oatmeal, which should be similarly soothing to your tummy.
There's bound to be someplace you could order in online, also.
Good luck! Hope you feel better soon!