For the record......you are not stupid! You allowed yourself to fall into the same trap that so many of us do....."married with children". This has all been a whammy for you and you have to relearn some things and most of all....you need to kind of reinvent yourself. Make it exciting to yourself by setting goals to achieve.
Be thinking about some boundaries for your W, and if you aren't sure what or how to apply them....read Coach's thread about boundaries.
Practice acting self-confident. Think positive and talk positive to yourself (instead of feeling"stupid", etc.). Get a new look and some new activities. Pay a little special attention to yourself and do something that makes your ego feel better.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!