Ouch I remember that feeling, and the stress of needing to establish feeding before we could be discharged, so much pressure! I was expressing blood at one point, horrible.
All the above tips I agree with but the thing that helped me more than anything was hiring a private lactation consultant. She came to my home (we eventually managed to get discharged after promising to top up with formula, which we were pretty much forced to do in the hospy), and gave me clear and concise instructions as well as sat with me and gave me hands on help. She was on call for next 24 hrs and called for regular updates and it really helped me to just have the one person (rather than conflicting advice from various hospital midwives).
The breastfeeding association helpline is also a good option.
It DOES get easier and nipples heal mighty fast. Plenty of that nipple cream (lanloine?i think?) and air out your nipples whenever you can.
Best of luck and congratulations. Don't feel bad about the bottle either you have at least 6 weeks to establish breast feeding, just get to the point they will let you home and it will get easier x