Just a thought...Are you taking any liver/gallbladder supportive herbs? The ones that come to mind: milk thistle, dandelion, artichoke, boldo? Also n-acetyl-cysteine?
Vogle makes a liver tonic with the above herbs...http://www.mehndiskinart.com/Boldocynara_Liver_Tonic.htm
I second the suggestion regarding a parasite cleanse.