goodmorning I am a 25 yr old american female who is living in Madrid, Spain. Over xmas I took a trip to Thailand. While there I was sick. I assume it is from something I ate. After returning to madrid and seeing my dr many times he thinks I may have a parasite. However he is unable to find it even after 6 stool samples. He treats anyways with flagyl. A week after finishing the flagyl my symptoms seem to subside. I then notice that my tongue is white. He thinks it may be candidiasis and prescribes nystatin. This gives me diarrhea. I have a decreased appetite and I often feel cramping or pain after eating. What further tests could I have to discover what may be wrong? I just want to feel healthy again!!