I think by definition all low functioning DP/DR suffers have ADD, because when these symptoms are severe, you simply cannot concentrate.
I have a long history of severe tiredness/mild depression, light sensitivity, fuzzy 2d vision, dizziness, poor concentration and complete 'brain freeze' in situations where there is artificial (flouro) lighting. Surprisingly these symptoms are related to a type or dyslexia called Irlen Syndrome.
One shrink I went to thought I might have ADD, but given my history and the fact that all my symptoms got 10 time worse after taking medication I was beginning to suspect that my problems where DP/DR related. The same shrink was positive that derealization was caused by 'overbreathing' ( I didn't take too much notice of what she had to say).
When my massive DP/DR episode came on a couple of years ago, fluorescent lights would literally incapacitate me. I felt like I would lose consciousness and often have a kind of confusion/disorientation attack at the same time, in addition to tripping like I was on acid.
I've been working with Holosync type binaural sounds for just over a year now and gradually my perceptions are becoming clearer. I've gone from being hospitalization style sick, to being a low functioning (healthier, happier) version of my former self with greatly increased awareness....so yes, I have ADD and dyslexia but I also have mild DP/DR. Either way, these disorders can involve 'concentrational' dysfunction so they're probably one in the same.
Btw, I would like to know if any other low functioning DP/DRers out there suffer from 'Irlen Syndrome'?