I have been ill since visiting Guatemala 3 yrs ag with diarreah ,gas and bloating- extensive testing,blood and stool , showed nothing (but indicated enlarged blood cells ) and a 3wk course of doxy for lyme 'cured' my diarreah but it came right back- and it is made much worse when I eat carbs . My GP told me I was "fine",and when I pointed out that I wasn't he sent me to a gastroenterologist who won't even talk to me and wants to do a colonoscopy and endoscopy . I will not do invasive tests and do not have diverticulitis/can eat nuts etc...better then I tolerate most foods . Have long since cut out gluten,dairy, and any processed foods . Would this be diagnosable without invasive tests ? It sounds to me like tropical sprue and I might have to return to Guatemala to get treatment -help ! Would appreciate any opinions .