Since it was mid to high back, chances are more likely to be gallbladder pain than kidney pain! :)
You're taking an awful lot of gb/liver stuff all at the same time - slow down a bit. :) If you want to do another flush soon, then just take the malic acid and occasionally the stone free. If you're not planning on doing a flush soon, just take the planetary formula BLC. :)
Since you're in pain, probably best to plan on doing a flush soon. Malic acid will do what it can in about 7 days - more or longer is not necessarily better. Then it's best to flush, take a break, then start it up again to de-clump the remaining stones in time for the next flush.
Hope that makes sense! :)