Speak to the head of your church first for spiritual strength, then talk to a L ASAP. Find out what your rights are and be sure you mention how you are afraid she is going to do something to paint you in a bad light. Protect yourself and your kids.
This^^^ and then do something for yourself. You sound like you need an emotional break. No matter how small, is their something you enjoy doing for you? Do you exercise? Go for a walk w/ some music or take 45 minutes to do something to try to take your mind off the sitch.
Even if you have to force yourself at first, you have to find things to do or you will remain stuck focusingobsessing over your w. I know because I have been there.