Ginger,
I am seeing a social worker for ADD, and the best advice she has given me is to simply stay in a PRESENT state of mind.
When I’m in a rut, I take a deep breath and ask myself “What is the best thing I can do for myself at this moment?” It really helps me stop dwelling on my past, and to stop worrying about what I need to do later.
So, when you’re eating lunch, worried about all the things you have to do for the rest of the day, finish lunch first. 