my ex is not OCPD, but I have seen the same manic / depressive states.
Staying in bed for days, then getting up at 6am cooking up a storm, shopping, overspending, making big plans then back to being in bed for days and me cleaning up the mess from her manic cycle.
I have heard from a psychologist and from reading that BPD and NPD are often misdiagnosed as Bipolar and I'm sure it is the same for other personality disorders.
My ex was diagnosed as bipolar and I can't say one way or the other if that is true or not.
The antipsychotic bipolar meds do work to help level out her mood swings.
But even with her moods under control she still has the disordered thinking patterns and regular blow ups with the kids.
Just like Athene mentioned she does a great job at the hero / victim / persecutor triangulation with the kids.