This exact same thing happened to me as a child. I was 9 or 10 when I developed an extreme and unexplained fear of throwing up. The thought of going to school was so terrifying to me that I would start hyperventilating every morning before school. It got so bad that I eventually needed someone that I trusted to accompany me to school and sit with me through class. I always needed to sit near the door so I had a fast "escape route"
I know that I was molested as a child but I know for sure that there are things that I can't remember. My gut tells me that something very bad happened, I just don't know what it was. I have issues with being very angry towards older men for no reason. I despise them, and automatically think they have bad intentions. I don't know if any of this helps but at least you know you have someone to relate to seeing as we have almost identical problems. I wish you the best of luck getting to a peaceful place.