Credible or questionable, I'd still go to a local urgent care or ER if it was me. If it's a serious infection delaying treatment by hours or days can make a big difference in your long term prognosis.
Also, all hospitals in the area I'm sure have seen cases of whatever it is you have many times, and will know how to deal with it.
Don't wait, get a trained physician to check you out.
You can always get re-checked by a US doctor when you get back home, but getting checked now will make sure that you get back home ok.
Plus, the flight back home with chronic diarrhea would be just brutal.