Is it normal to be extremely physically repulsed by someone

Being around my mother makes me physically sick. I'll tear up if I brush her hand accidentally and I have to brace myself for any physical contact. When she enters a room my mood immediately plummets. She's done nothing wrong, there's no logical reason she would be annoying or irritating to me, she doesn't smell or look bad or anything. I was never abused. I'm trying not to be an angsty teen about this, she's fine as a person I just can't stand to be in the same house as her, and I have very physical reactions to her. What's wrong with me ? (Also, this has happened with a few other people, both who I convinced myself I loved but then the truth came crashing in and I would heat up inside if they were even in the corner of my vision.)