Good luck with your colonoscopy tomorrow! I'm 26 and just had one last month. Yes, the prep was awful! I'm really sorry you have to go through it during your period; I can understand feeling kind of weird about it! My doctor is a woman; I think that sometimes makes it a little easier. Anyway, make sure they give you some kind of sedative, like Demerol or Versed (or both). Then you won't feel or remember a thing. I felt the same way; I WANTED something to be wrong with me. But, it looked like plain old IBS. I'm a D-type. It's so funny; my D disappeared about a week before the procedure and hasn't been around for 5 weeks! Unfortunately, my stinky gas problems remain!Again, good luck and take your mother or a good friend along with you for moral support. Hope we will hear from you soon.