I Have Had Watery Diarrhea For 5 Weeks. I Was

I have had watery diarrhea for 5 weeks. I was tested for C-diff and Giardia and both were negative! I have not had any other symptoms...no fever, no loss of appetite, no weight loss...I am at my wits end and don't know what to do but am so very tired of pooping all day long in my pants!! Any ideas?? Please help me!!