I think this is a great plan for you to get some clarity! I hope your husband will take this time to work on himself as well.
And to echo Lexie....I share the same concern. Please please call for help if you need it! You have the right to do this whether you are married or not. You have the right to do this whether you live together or not. You have the right to NOT know how long this will be for.
(((HUGS))) I'm so glad you have a therapist you are comfortable with, and please keep us posted. I can't wait to see see the changes in your life from taking these steps!