Are you all in psychotherapy? What you need is to get at what's causing your stress to begin with. You will probably never remove the symptom if you don't deal with what your unconscious mind it trying to tell you.
The following is addressed only to those who are not in psychodynamic or psychoanalytical therapy:
If you're holding in feelings, if you're angry and someone and choose not to express it to them, if you're regretting something you did in the past, if you have old pain that you've repressed, feelings of negativity, and so forth, the next time they force your body to try to save you, you may, instead of DP/DR, get a rotten immune system, a heart attack, ulcers, or you may just snap straight into insanity.
Please don't yell at me for trying to scare you. I *am* trying to scare you. If you find a way to get rid of the symptom, which is ALL this is, you are going to suffer tremendously down the road with severe problems that will debilitate you.
So, I am begging you, if you're not in psychotherapy, get into it. Let the poison that is in you -- the source of the symptoms -- come out of you. If you don't, you will get sicker and sicker and sicker.
Listen to your body. Psychosomatic complaints are ALWAYS about what's bothering us.
Now if you're scared of doing inner work, don't be. The relief can be immediate -- and I mean IMMEDIATE. You'll be sitting there crying at your therapist's office (I agree with Janine that for this, the best psychotherapy is psychodynamic, not cognitive) and you'll be hating how you feel and how you hurt, but you will all of a sudden feel something happen. You will feel rejuvenated and free. Bit by bit, you deal with the hurts that you've buried (we all do it, so I mean the generic "you"). Even the very first time you dip into the pain, even if you cry just a little, you will feel some relief.
Unless you address the cause of the stress, you cannot possibly ever recover from DP/DR. You will get sicker and sicker, as I described above, with other maladies, some of which may in fact kill you.
This diatribe has been addressed to those of you who are NOT in psychodynamic or psychoanalytical therapy now. What you do NOT need is behavioral therapy, because that will not help you access the source of the problem.