Your message breaks my heart. I wish I had a cure for you.
I read back through your posts, I see that you tried lots of herbals, but I'm not sure how long you stayed on a program. I saw that you also attempted to take garlic, but it was unclear if you ever stuck that out.
I'm not trying to scare you, but there is always the chance that you have something more serious going on, even if you do have parasites also. Do you have insurance? If so, demand a full workup until you find the cause, maybe your doctor will give in and parasite test. If you don't have insurance, it is tough, I know, I have spent many thousands out of pocket.
Have you tried DE? I have never used it, but it is recommended often around here.
It still sounds to me like there is something else going on, 6 years of continuous cleansing, should give you some relief. I still have a problem, but I'm much better after 2 years.