You don't seem insane. You may have some psych problems like many of us do (you've said you have ocd). People like your wife will undermine your sense of reality until you doubt yourself. Gaslighting, crazy-making, whatever you want to call it.
Regarding your mom, " I do not think my mother is the monster my wife says she is." So, there you have it. You shouldn't have to disown one or the other. You have only a few people left in your life - your wife seems to want you to lose one of the few remaining people you have, so that you have no support and you will be under her control completely. Losing your job would also render you without financial help or a place to go during the day. Then you'd need your wife even more. Your mom and job are among the few sources of support you have left, even if tenuous.  :)on't let her take them away.
Hi hurthusband,
Listen to your intuition, is there a sense of jealousy from your wife with your mom maybe? Your family has known you for your whole life, decades long relationships.
My ex couldn't stand the relationship I had with my sister and split my sister black when my sister said something invalidating and she likely felt like she was rejected. My ex tried to make me feel guilt for several years, that I wasn't defending my wife and she went as so far as saying that I wanted to sleep with her because I loved her more than my wife.
I'm closer to my sister than other family members.
I think momtara makes a good point, she's trying to undermine your sense of reality. I thought I was going crazy or there was something wrong with me after several years of her dissociations and projections.