I second the nipple shield! They are the reason me and dd are still breastfeeding! The 1st 2 days of her life she had a hard time with positioning, and had a VERY strong suck, and i ended up with blistered bleeding nipples and was crying while i was nursing. I got a nipple shield and within 3 days my nipples were healed and we are no longer using the shield. Get to a LC for latching and positioning, and buy a medela nipple shiled. You def. wont regret it. I almost gave up, and these were a god sent. It will still hurt a bit, but it will be 90% better!
Good Luck, and Im sorry you are having such a hard time. I was very dedictaed to making this work for us too, and i was in your shoes just a week ago, dont give up, it will be worth it when everything is healed.