have you ever tried raw food sources of vit. a? it is possible that the raw food sources would be able to help you detoxify the toxic forms. i would try some very small doses of carrot juice or raw liver to see what happens, very low dose in case it doesn't work. stay away from all synthetic forms of vit.a and perhaps even beta carotene.
add in turmeric, milk thistle, and hepatoprotective herbs to the diet.
try beets, sauna, clay packs over the liver.
perhaps a change in diet, do the george costanza opposite diet-- whatever you have been doing, try the opposite. i.e if you are vegan eat meats, and if you are eating hamburgers every day, go vegan.