Hi star girl, I hope you are ok, you sound as though you are having a nightmare, hopefully your hospital stay will be brief.
Breastfeeding can be so hard just do anything you feel you need to do in the early days. If you cannot face breastfeedingl give a bottle, but express your milk at right after each time. Use lansinoh when expressing as well as breastfeeding. If you decide on nipple shields, there are a number of different ones, so experiment until you find one that works for you.
A little bit of formula, just to get you through, is not the end of the world, provided that if you give it, express your milk at the same time to keep your supply up.
Yes it hurts a lot at firstl I am now 9 weeks in with DD3 and it was sheer torture for the first four weeks, as I had ductal thrush. Check out this as well, just in case. Does your baby have a white coated tongue, do your nipples look very shiny. I expressed and mix fed through this, not through some huge desire to continue breastfeeding but as I could not face the pain of winding my milk down.
Normally, breastfeeding may hurt when baby first latches on, but after a few seconds (if you grit your teeth and count to 20) that should stop. If it carries on then check for, thrush (as I said), tongue tie and your latch.
Finally if you just don't want to, then don't formula feeding is not the end of the world, and you have already given your baby a great start.