I'm sorry you feel sad. Of course you are sad, this is a process that hurts like hell. One day you will be up and the next down. I am going through (I think MLC) with my H now and what makes this even worse in my 20's I went through the OW and all the crude with my first, with my baby daughter. What helped me more then anything was work. Thank god for work. I would rather be mentally exhausted from the office than personal hell and that sick pit in the stomach. Focus on that and maybe get a kitty that you can come home to.
Big Hug, one day at a time now (or one hour at a time).
Trust me... It will get better time is a healer if you keep busy.