Have you tried these?
Antifungals/good for leaky gut: Neem leaf,
http://www.raintree-health.com/amazon-a-f-3/
cats claw, guacatonga,sangre de drago, slippery elm?
You need something to cut inflammation in the intestines. Some of the above herbs plus avoiding things like caseine etc.
Have you tried antiparasitic treatments? The famous humaworm or
http://www.raintree-health.com/amazon-a-p/?
I mean something its tearing you apart since years and it seems you havent been able to find what it was.
These rainforest herbs are not well known but I have seen some cured stories with them. I have the gut feeling they are probably the shit for candida or
parasites and I plan to use them when the time comes.
It could be heavy metal intoxication, mold exposure, candidiasis or parasites. Or a combination of some of them.
In any case, you need to get some strength and stability to have any chance to detox..
Also, why dont try something in the enema route since it seems some of your pain its colon-located? Like kefir enemas or something soothing or rebuilding.
Finally, I highly reccomend doing the egg
Liver Flush every morning, makes me feel better. Use two lemons,lime in the juicer, whole, dont peel them, then add one tbs of pure olive oil and two raw egg yolks, mix this and drink. Actually tastes pretty good. And I would look for the most pristine spring water and drink two liters at least per day. Eat all the cooked veggies you can.
I hope some of this can help you...