Sorry to hear your son has Crohn's. It is one of the worst things ever when you pass down a disease to your kids. My oldest daughter has been sick off and on with D and low grade fevers over the last few months. Yesterday she vomitted and had violent D most of the day. She has also had trouble swallowing at times. This is exactly had I started this stupid disease, at just the same age. She just broke up with a boyfriend after a long 3 year relationship and I know she is stressed so I am hoping that this is causing these symptom. I already gave her polycycstic kidney disease so it breaks my heart to think she also has Crohns.
Good luck with your son and I hope all goes well. I am sure you have learned a lot of tricks of the trade over the years you can share with him. Maybe he will have a much easier time than you did.