Yeah, that sounds like about what I had. I believe that I received a general anti-biotic for my little friend (the Canadians call it "Beaver Fever," or at least the ones I was with did). I'd been out in the woods for a month and a half and it hit me right when I got out. I thought I was having trouble readjusting to real food but it kept up for a while and none of the over-the-counter remedies I tried helped at all. Finally went to the doc, told him I had giardia (I'm that kind of patient) and got the pills. According to this website, Division of Parasitic Diseases - Giardiasis Fact Sheet, you can check for giardia by testing a stool sample. Or it could run its course in 2-6 weeks. Not sure if you want to wait that long though...