Philosophy and 'Pure O' ocd -- How to survive?

How do you avoid the constant rumination and uncertainty? It's dreadful, my mind goes in loops, and when I finally find the relief of where I stand in a certain philosophy,(though I can never be certain, ovbiously.) The overwhelming uncertainty only concentrates on the next unanswered concept. and I'm sure you know how deranged and disturbing this genre of thoughts can be.