Cryptogenic Hepatitis?

I have cirrhosis with a TIP shunt and am currently waiting for a transplant.  Originally, I was dignosed with autoimmune hepatitis,and also with achalasia.  When my records were transfered to my transplant center, my hepatologist didn't agree with the biospy results and had them reviewed.  Now my liver disease has been listed as Hepatitis, Stage 4, Grade 4, etiology undetermined (Batts and Ludwig).  After dozens of test they still have not determined what is causing my hepatitis.  They would like to do another larger biopsy but due to low platlets (48) this is not possible.  While in junior high school, my school was exposed to Hep A and everyone received a gamma shot.  I'm wondering if back then, with our blood supply being as contaminated as it was, if I wasn't exposed to Hep B or Hep C through the gamma shot, even though these tests have come back negative.  Can AIH be in a "quiet" stage and the titers be low or even negative?  Crypotgenic hepatitis is still hepatitis, something is destroying my liver, just trying to find out what.
Thanks..Brainfogg :)