I'm going CRAZY

my mom married a man that I only met once. I went in with an open mind because that's who I am and I don't want to judge or make assumptions as soon as I meet the person. So fast forward he's been living here for about 3 -4 months and I'm going crazy! I can sit where he sits and I can't touch things he touches. I've always been a bit of a germaphobe with people coughing and not washing their hands. But with him I can't get over it. All it has done is gotten worse. I can't take a shower in her room with out bleaching the whole shower and using a paper towel when touching the door knob. I can't touch the dishes if he put them away. I don't touch the refrigerator without a paper towel I can't pet me dogs after he touches them. I know that I don't like him but it's getting worse. I have tried to get over it talking to my mom and others. And I can't wrap my head around it. When I was staying with my boyfriend a lot I didn't have this problem even though I don't like his mom. Please help 😬