I don't have it, nor do any of my family members. But I read a book by a psychiatrist who is schizophrenic and her claim is that she had dialysis of her blood for a period of time and it was able to filter out of her system some type of abnormal protein (or something) that was affecting her mind.
it won't help your MPD one bit. MPD, is trauma based . the heart/mind splinters to protect itself, when having to endure something it perseives as extremely traumatic. I've also adjusted my diet very similar to what you describe. I include probiotics, raw vinegar, live culture yogurt, as well as homemade fermented foods in my diet. in a physical sence, I feel really good. but it was not what helped me thru my own MPD issues.