Lookout, so sorry about what you're going through. I felt exactly like you, afraid of the next feed, though breast shields never worked for us and the snip had immediate results.
Try to hang in there, take paracetamol
one hour before feeding as it takes a while to get working. It may have been mentioned before but also feed in different positions so your nipples don't always get bitten in the same way. On the days when the pain was unbearable, I expressed from the worst affected nipple and offered that in bottles. It's important that you keep your nipples in as good condition as you can, both for breastfeeding to continue and for your own sanity!
I was really worried about nipple confusion but a breastfeeding consultant told me that it's more likely that babies that refuse the breast after bottle feeding because the mothers milk production has suffered rather than the nipple itself. So as long as you express and still offer the (less hurt) breast you should be fine. I had to give dd some formula topups and expressed milk for a few days, and now we're back to breastfeeding solely.
I have the exact same issue with sleeping as you do, dd will only sleep in my chest and occasionally I will be able to shift her next to me on her side, so she's still really close. Most of the time though she will wake up and taken back to my chest.
What I will try is another consultant's suggestion: to put a hot water bottle in her basket for a while so she's not woken up by the heat and also to out some used breast pads under the sheet so she can smell your milk. Also a worn shirt under her or next to her that smells like you.
I plan to start doing that during the day when she naps and stick with my chest in the night, simply because I really can't deal with any extra pressure when I'm extra tired at nighttime.
I hope your meeting with the consultant tomorrow goes well, sending you lots of courage and well done for sticking with it despite the hellish pain. xx