Certainty work will your doctor and try to get at least a GI specialist involved if possible. Hematologists will be needed if it is determined that you do have AIH, but getting in to see one is difficult and usually requires referrals. And, since your ANA is at least borderline, get a rheumy involved. Your fatigue and joint pain maybe due to the AI issues. Your liver has to be almost completely failed before it will cause systemic issues like these. Good luck and hope you can get to a proper diagnosis quickly - these things usually always proceed smoothly and a liver biopsy might be needed.
I meant "Hepatologist" ... not Hematologists ... spell checker wasn't paying attention, nor I.