Been a more is no easy thing has you have lot of responsibilities that you oftentimes forget about your wellbeing. It's normal to want to take time to treat yourself nice or have alone time, I don't consider it a selfish act. You are human and it is normal to think about yourself. No one is a superhuman, so do what you feel is best has long as it makes you more relaxed and happy for the time being. It is also important to communicate this things with your husband, I believe he will also understand. You may need his assistance in certain times so you don't get burned out from work stress at the office and responsibilities of taking care of the children and the home.