I have a similar issue with anything related to broken bones, the thought of them, the possibility of a bone being broken, or someone near me with a broken bone. I faint. I don't know what exactly bothers me about it. I have no problems with shots, blood, watching surgeries (that don't involve bones)... Etc.
When I start to feel faint I have to sit or lay down. I'm sorry I don't have any advice as to how to help your ds not feel uncomfortable about it. His feelings are valid. Some people just can't tolerate anything medically, my dh is one and will actually plug his ears and sing to avoid hearing it. Lol
