Corky - first off am a bit confused - how old is your baby and how long have you been b/f for five days or ten weeks? I totally agree that ten weeks of extreme pain is more than enough to knock anyone for six - let alone a new mum (presume this is your first - correct me if I'm wrong).
I had a horrible time establishing breastfeeding - ds wouldn't latch on, he'd start sucking and then shake his head around and come off - and I found it all very painful etc etc. Finally, after several awful weeks - during which time ds was getting smaller - I gave up and whacked him on a bottle, despite being heartbroken that I had "failed". That same night he was screaming with hunger but the bottle was too hot - so I whacked him on the boob to try and pacify him while the milk cooled. Incredibly, he finally got the hang of it and started sucking for all that he was worth. It was still touch and go for a few weeks - but we seemed to have reached a new stage, so I persevered. That was two and a half years ago and I ended up breastfeeding for a year. Yes, it was a lot less hassle than having to sterilise bottles and mix formula and I am glad that I personally managed to do it. However, having said that, if you have been trying for ten weeks and can't take any more then DON'T. A new baby is hard enough work without all the pain and guilt that you are obviously going through. You need a break.
Alternatively, try expressing - then someone else can give the baby a feed and you can get some much needed kip. I know what people say about the minute you give a baby a bottle it's no longer interested in b/f - but that wasn't the case with my son, if anything it helped him get his head around sucking. Don't know if it has any relevance, but my ds had a traumatic forceps birth (looked like an elf his head was so pointed) - and I strongly believe that he had the mother of all headaches for quite some time that didn't help matters. In hindsight I should have tried cranial oesteopathy - frankly anything's worth a punt.
All this said, if you are only five days in be aware that this is early stages and b/f can take a while to establish - so don't give up if it's simply because you think it should have all happened by now and have become convinced that it won't happen for you.
Conflicting advice I know - but while b/f worked for me in the long run I do feel that I went through hell to get there. So do what is right for you so that you can be a happy mummy - and if you do decide to give up don't let anyone make you feel guilty - let alone some midwife who may not even have kids of her own. The most important thing is that you all bond with your baby and can concentrate on being a family. (PS: No offence meant to our very own Mumnsetter midwives M and L, if I could turn back time you would have both been at my bedside!)