very good news!
i was reading about large breasted woman nursing while laying down. Here are some og their tips:
receiving blanket under breast
get baby latched on upright then drop into a laying position
laid back nursing
put baby's feet resting in your belly and baby's head angled away from your body a little
maybe one or a combo of those will help. remember it takes practice so even if it only works for a min or two that is a step in the right direction. good luck