The diagnosis is collagenous colitis, which I already knew from MyChart. The good news is that it's both benign and curable. The treatment will be nine weeks of budosenide pills, starting at three/day for the first three weeks, then two/day for the next three weeks, and a final three weeks of one/day. Those are to be taken with food, and in the morning because it's related to steroids and can interfere with sleep.
The most common risk factors for this kind of colitis are being a woman over sixty, and regular use of NSAIDs. Therefore, Dr. Morgan wants me to talk to Carmen about whether there's a plausible alternative to me taking naproxen almost every day, but she did say there may not be, since tylenol doesn't work the same way and may not be effective for the hip and knee pain I'm using it for.
I asked about continuing the Imodium and the fiber capsules, and Dr. Morgan said I could stop using them when the budosenide starts to be effective for the diarrhea, which might be within a week. I told her that the combination of Imodium and fiber is working well enough that I may not notice a difference, so the tentative plan is to wait at least a week, then pick a day or two when I won't need to go out, and try stopping the Imodium. (Adrian pointed out that I'm currently taking two pills twice a day, so I could try halving the dose and see how I feel. That sounds plausible, but I'm going to ask Dr Morgan if she thinks that's worth doing.
Also, a significant number of people with collagenous colitis also have celiac, so she wants to test me for that. I asked, and it's a straightforward blood draw, which I can do at my convenience: I don't need to wait until after getting blood drawn to start on the new medication.
She is sending the prescription to CVS, and told me to call her office if there's any problem with the insurance company.