Shelley, what is the "microbial balancing program" and what does it involve? I'm intrigued that you don't take probiotics - I don't either. ;-)
I'm not saying that PD can't ever make a difference. It can - but only when either:
1. It is used in conjuction with other therapies so that several chains in a vicious circle of ill-health are broken at once.
2. The underlying problem is microbial and nothing else, in which case it can "reset" the gut. Even in this case the bacteria in PD will exit the body having done their job of eliminating the bad guys.
The problem is that PD alone won't do anything for most people with severe bowel-disorders, as all that will happen is that much of the bad bacteria will get removed, only for the remainder to re-grow - possibly now even being resistant. Its a bit like taking anti-fungals. I have certainly found this - PD is less effective with each successive application - the candida are adapting using natural-selection.
Anti-fungals can work for mild cases of candida, where the candida isn't sufficiently ingrained to be causing systematic problems. In the same vein PD can work for mild cases of candida (or where bad cases have been reduced to mild cases through dilligent use of cleansing).
In your case I suspect that you did a lot of the work yourself through the cleansing protocols you've outlined, and that PD was simply the final nail in the coffin.