I am far from and expert, but I would stop and think here. Here is my 2 cents after about 60 seconds thinking about your problem.
;-)

Was your food passing undigested before you started all this, or after?

If it has come after, then maybe you should take a break from all the cleansing. Maybe you are reacting with hives to some of the chemicals you are taking to cleanse. Maybe you are missing some of the friendly bacteria in your colon required to digest your food. You could try to add these natural digesters back and take a break from everything else.

On the other hand, it is entirely possible that the hives are a reaction to burning fats and your body dealing with all the toxins from the flushes. If it were me, I would still add back some natural digesters.

There are so many Colon Cleanses out there that it is hard for me to keep them straight...but if I remember correctly Herbal FiberBlend contains some pretty aggressive herbal laxatives...senna, cascara sagrada, cape aloes, turkey rhubarb?...which can cause food to pass through you before it has had a chance to digest properly. I would suggest that you use psyllium with liquid Bentonite instead of the one you're using now.

By all means include digestive enzymes...there are many formulas available that also contain HCL.

Use the probiotics after you've completed the colon cleanse...they'll implant better in a clean colon.

I use an enzyme called AborbAid and really like it. I have used
many brands and this one works the very best for me. I have had the same problem with food going through undigested but after doing a 6 months Colon Cleanse and getting rid of my candida the problem has slowly reversed.

The probiotic I use is Herbal Healer brand and is one of the best. It is a powder and when mixed in juice or water gets to where it needs to be quickly. You can find it at their website,
www.herbalhealer.com - They have wonderful products and their
candida treatment worked like a charm for me.

I started doing some cleansing but unbalanced my body chemistry. I saw a Kinesiologist to try to find out what exactly was causing the problem. Here's the thing, if you are taking too many things at once, you will never know what is working and what isn't. Anyway, it turns out that I am not strong enough to do a cleanse at the moment and have to work on my digestion first. I have to take HCI (I'm taking Biocare) as I have low stomach acid, Spectrumzyme (Biocare) and a probiotic (Biocare again, they won an award for this). So perhaps you should first concentrate on getting your digestion in good order and highly nutritious diet to build yourself up - in preparation for cleansing. I would definately recommend Kinesiology to find out what agrees with you and what doesn't. For me, I tested negative for the Psyllium but positive for the Bentonite. And also because of poor digestion I need the B vitamins so a supplement of that is good (Higher Nature).