U got e x p o s e d's Things

Hello!
Since last year I think, I started having a really disturbing feeling when I'm around men. It can be anyone: my father, my brother, a friend, another family member, a stranger in the streets. Really. Anyone.
It starts with an unpleasant feeling. I want to leave, to get away. Then my heart starts beating faster. I get stomachache, I want to puke, my mind becomes dizzy and my entire body shivers.
Maybe it sounds idiotic, but I don't know why these things happen to me. It only happens around men so one day, while thinking about it, I asked myself if I was scared of them or not.
That's why I'm asking here.
Obviously, the feeling is more or less strong depending on the person I'm with. I'm ok when I'm with my father, my brother or a friend. It mostly worsens when I'm around some people in my family (like my uncle) or when strangers in the streets or anything are too close to me.
I don't know if these I get these strange feelings because of everything that has happened to me with men.
I don't know how to stop these horrible feelings, and I don't want to talk about it with anyone by fear of being laughed at because this seems ridiculous....