I'm so sorry that you feel this way, and definitely second seeing a lactation consultant, even if it seems you are doing everything right, because sometimes they have random helpful suggestions about positions, herbs, or just are a shoulder to cry on. That helped me with my first guy, when I had six blisters on each nipple, low supply, and a kid that screamed 24/7 and was not gaining weight. I also had feelings of anger and wanting to throw him out the window!
With my current baby #2, now three weeks, I still HATE breastfeeding but I am able not to blame him. Thank god for my serious issues with my own weight, because if it were not for the weight loss effects of breastfeeding, I would not do it for one more second.
It sounds terribly selfish (I know how bad it sounds, but I'm being honest), but the only way I can get through this and not blame my baby is to think in my mind that I am doing this for ME...get my uterus back in shape, lose weight, reduce risks of cancers, have a break from my period, save money. Just how I cope.