I am at work on a different computer. I go by the name of "Goal" now.
I am sorry you are going through this. If your H is in MLC, the OW is nothing, nada, dirt, non-important, etc....
Work on yourself and take care of yourself. No man is worth you getting ill/sick over. Your son needs you now more than ever.
Are you following the DB techniques: 1. no crying, begging, pleading with H. 2. no pursuing behaviors 3. no relationship talks 4. get a life 5. act happy when he sees you 6. don't always be available etc................
Forget the OW exists, she is a crutch for his pain. Your H cannot have any meaningful relationship while he is in MLC. He has to go through all the stages to find his way back to you.