I spent ~10 hours a day for 4 years with my friend who is extremely bipolar.
First and most important is to stop taking any prescribed medications.
Second, replace all dietary salt with
Solar Cured Sea Salt
Third, I recommend a ritual use of Ganja either eaten or smoked.
My friend is not OCD so not sure if these will help with that but he is definitely much more stable now as far as being bipolar.