Hey Carmen - I just posted a reply on your other thread about sleeping, but I see now what the issue is with breast feeding. Sounds stressful and exhausting hun. Not much fun at all.
I have only one little suggestion, which maybe you've already tried. I found that Emily latched on BEAUTIFULLY when I lay down on my back with her on my belly. I just have to put my finger by her nose so she can breathe! (I'm pretty full-busted, and she'd smother otherwise! ) Have a look at the breast-crawl video clip here on BB, and you'll see what I'm talking about. HTH!
All the best.