Jen,
I think stress probably greatly contributed to your prob!!! Kim is more of an expert than me since I have not had LIS, but I think he still has an occasional prob even after being 2 years (I think) post-LIS. You seem to be a superachiever and put a lot of pressure on yourself to get good grades in school! My husband used to tell me that I would do anything to get an A (well, almost anything!).
I would just try to relax and know that you can get this all sorted out after your stress level declines. There is a reference in one of my books about fissures and stress. I'll try to find it. Meanwhile, hang in there and know that this too will pass. I think it is amazing that you traveled to and from Hawaii with no issues. Flying/traveling is hard on the digestive system and butts!!
Cheryl