How are you feeling now?
My nipples hurt so much with DD, and in fact didn't stop hurting 100% until week 6. I'd set myself a goal of getting to 6 weeks and I did it and went on to bf until DD was 22 months and I was pg again.
A few things:
If you just can't face it, try expressing a bit. It hurts a bit as your nipple is pulled into the pump, but only at first and then it stops, not like tiny newborns! Then you or DH can do a feed by bottle and give your nipples a few hours respite. If you can, try to let DH do it and you go to sleep.
My DD was 6lbs 5 and lost a lot of weight to start with - on day 5 she was 5lbs 9. I do think her tiny little mouth made it more painful and that part of the improvement was down to her growing a bit. DS was 7lbs 3 and also, by that time my nipples were used to it!
I cracked it when I tried feeding lying back. My usual MW (who was lovely!) taught me to sit bolt upright with DD on a stack of pillows at breast-height. She kept slipping and I kept hunching. Then another MW came out at the weekend and she taught me a different way - to lean back comfortably in a corner of the sofa and bring DD up to my nipple, so she was lying diagonally on my tummy with her head supported on my arm, and my arm supported by the arm of the sofa. It was much comfier and that helped me relax, and the cosy cuddling I think calmed DD too. So that really helped!
And try a proper breastfeeding supporter if you're still struggling. As I said, my first MW was lovely but she hadn't breastfed herself (was unable to have kids, sadly) and I think which position suits a woman is really individual. Plus it never hurts to get a second opinion on tongue-ties.