It's nice to hear that you are back in the states... We all know how eager you were to come "home."
Have you been checked for H. pylori (blood test)? For an accurate parasite check you should probably have a couple stool tests done (a couple days apart from each other).
That's all I can think of at the moment since your scopes haven't shown anything.
Good luck with the C-diff... Hope you don't have it!
Co-Moderator for the IBS Forum