Ah, and I do have personal experience w/OCD.
My father, my husband, a close friend who took her life recently (not to scare anyone, she was also very depressed) all are/were hoarder-clutterers.
A friend of mine has OCD of a religious nature. She would also go into panic which culminated in DP/DR. Once treated with Prozac or Zoloft (now for many years) and having CBT she is doing much better. In her case treating the OCD eliminated the DP/DR.
My father and my husband to the best of my knowledge, as well as my friend did not experience DP/DR.
Again, DP/DR can be experienced with most if not all the mental illnesses. I can't say it is a "symptom" -- I'm starting to say, "It tags along, the nasty thing, and sometimes responds to the treatment of the primary illness, or doesn't, or fades."
I have noticed that with time, meds, therapy of various sorts my chronic DP/DR is currently less troubling.
The concept of the mask? For me, it has been not "being myself" in the sense of not speaking my mind. I was brought up to not acknowledge my feelings, my mother was very verbally abusive. I was to keep my feelings and things about my family "secret."
In coming out of the closet so to speak, I see a release of anxiety, and a lessening of the overall power of the DP/DR.
But I still say, one day at a time.
And yes, The Aviator will give you a pretty good picture of OCD. Obsessing over things, is not Obsessive Compulsive Disorder. That is well portrayed, and abundantly clear in the film.
OK, now the balcony is closed. 8)