I’m confused about the story here. I wish I could talk to the author and ask “What are you trying to do here?”
I felt that there are strong themes such as bodily autonomy, female sexuality, the mis- and under-diagnosis of women, partnership and parenthood. 
But the execution just doesn’t read well. Sometimes I felt that the author tried to explore too many things at the same time and other times focused on one topic for wax too long. 
I think it is already bad that I don’t know the name of the main character or what her work is. And even though we spend over 300 pages in her head, I still don’t understand what the fuck she is thinking. 
Most of the work is just the main character excusing her behaviour and gaslighting herself, other characters, and the reader into believing she means good. I understand that she is going through a mid-life crisis but I just think the execution was overboard. 
I am all for women exploring their sexuality, body and relationships at whichever age but the author wrote this as if the character is a literal sociopath with no concept of empathy or the honest truth. 
Maybe this was an attempt at an unreliable character but I wasn’t impressed. 
The other characters seem like archetypes that the author chose for each them and made a little development upon them. There is a lot of talk about developing and evolving but it’s rarely shown and the only significant change I could sense was in her husband. The character herself? Not really. 
I may give it a try later but I can’t promise anything.