I think the best thing would be to tell people on a need to know basis. If they are important to you in your life let them know, otherwise don't bother. I think your new girl would respect you for telling her (and might be in a position to help you sometimes). It might be better than making excuses when you feel anxious, she might thinks it's her and get upset..
Goodluck with it all, and let us know how you get along
I alone can do this, but I cannot do it alone.