Wow! Well done on the weight loss! Yeah, an unfortunate side effect can be more gallstones!!! Telman is the resident expert on much of this stuff. He may be able to offer some pearls of wisdom.
In my experience, lying on my right side with knee up, stops the purging of stones, but others seem to really benefit from it. I get best results relaxed on my back or relaxed on my left side. Right side seems to cramp up the GB/liver area for me.
Do tell us how you go with the vibrator. It could be very beneficial!