[blondeoverblue24]

I would recommend getting your own official doctor and if at all possible, make it a gastroenterologist. The gastro docs have a far better grasp on IBS these days and it will be a lot easier to convince them that you need this letter. If your doctor has a midlevel practitioner (nurse practitioner, physician assistant), you may want to get in with them - A lot of them have more available time than their supervising doctor and will be more apt to take on your case with the letter writing, etc. Plus it's often a lot easier to get in with them.