This post is more about Psoriasis than liver flushes, hope thats ok. I found your post doing a search for psoriasis/parasite, because I have a feeling now and again that that could be a cause. But I also think that may be just a way of thinking about Psoriasis as 'something that is doing this to me', whereas as I'm sure you know the standard belief is that it is a genetic condition which is triggered by stress.
When you say it took you a lifetime to get this way I know how you feel but I disagree, I don't think you have 'done this to' yourself through your lifestyle, especially if you were a child when it started.
Like most Psoriasis sufferers I've tried a lot of different things and I'm not sure that there is a cure yet. Having said that my skin cleared completely three years ago for a couple of months and I still don't know what made that happen.
I've also had the uva light treatment which is a temporary- several months or, for some, several years - treatment and you get a great suntan. :)
I've been doing bikram yoga this past month and have noticed a slight improvement. I'm hoping that it will eventually clear with the yoga. Another guy who has psoriasis has been doing it longer and said that the yoga does help but I'm hoping for a more than just help with the condition. Let me know if you get this post. I'll let you know if the yoga is working in another month or so.