I have been having trouble with raised liver enzyme levels as a result of taking 6MP. I am now off the medicine, but my liver is recovering very slowly, and I may have to have a livery biopsy. That depends on whether the levels come down in the next few weeks, and what an MRI of my liver I have scheduled in the next few weeks shows.
Fingers crossed it is nothing serious for you, and that the liver biopsy goes OK.