Whooooooo - just reading your post made me exhausted!!!
The only way to stop the obsession is to stop the obsession!
Some tricks I have used in the past:
Looking at the clock or setting a timer for 10 - 15 minutes max and telling myself OK B you can freak out and worry about all this until X time and then you are going to _________________ (fill in blank with something that you need to do for yourself).
or I say this ad infinitum until it pushes every other thought out of my head:
God grant me the
Serenity
to accept the things I cannot change,
Courage
to change the things I can, and the
Wisdom
to know the difference.
It helps me to remember that obsession is a symptom of codependency and that if I am going to break those sick habits of mind it takes practice. I believe that my obsessing is a way to not face whatever is cooking on my side of the street.
peace-
b