Why am I so uncomfortable around this man? He’s a friend of my mom’s. Every time I see him I feel inexplicably worried, anxious, and panicky, like he’s going to hurt me. He’s done nothing to elicit this reaction.

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Stay the hell away from him. If you trust your mom, tell her your feelings and ask her to look out for you. Try to never be alone with him and if you do find your self alone with him, pretend everything is normal until he crosses a line. If he does then fight with all your might. Do not listen to a word he says and assume it's just to manipulate you. If he argues with you threaten to scream and immediately request to leave.

But above all, stay the hell away from him.