I have been on 6MP for about 6 years now with no problems and it works well for me.
I have my bloodwork done every 3 months and then my liver enzymes done yearly. My Rx is set up for refills for 3 times and then my doc will not refill my Rx if my bloodwork isn't done.
If you have had elevated liver enzymes I would think that needs to be watched and I would insits and find a new doc if needed. Maybe your old doc could call the new doc?????