I've (luckily) never had to deal with thrush (knock on wood) but I just wanted to say I totally commiserate with you on the PAIN thing. I thought, after the labor and pushing (also no meds here) that I could deal with anything. But I had serious pain with BFing until 5-6 weeks. I was so sick of my life just being constant pain.
It does get better... one day you will be pain free again and you will barely remember how miserable you were. I guess that is a necessity or else we'd never want more than one baby!! Hang in there... sometimes i think they just need to grow bigger mouths and get some experience at bfing. My son was terrible at first but he's an old pro now.