Its pretty crazy as my allergy specialist had the same problem as me years ago and nearly died from vitamin a toxicity of the liver. The symptoms vary, including a dull feeling in your head, sluurred speech, skin problems, manic behaviour - almost a deadening of thought clarity. My symptons stated early on in life as a child and steadily got worse, as it was causing my immune system to crash and i was getting more an more colds and flu symtpons and have had to quit 2 jobs. I underwent an Elimination Diet to test foods that were causing my problems,and i have many intolerances but didnt seem to be getting anywhere after eliminating foods like wheat, fish, the usuals. As a last resort she suggested cutting vit a out of my diet almost totally, and imj pleased to say things have improved since. I can definetly say this is the cause of all my underlying problems, as when i have tried anything with beta caratene or vit a in i have reacted badly. i will introduced foods very low in vit a into my diet at some point, which include pale leeks and pale celery. My specialist has been on a low vit a diet for 4 years and she now feels better than ever. I have not undergone any liver flushed but have had a run of colonics which got rid of a fair amount of toxins in me - so things are going well and i seem to be revesing the downward spiral my life was taking.