I am with those who also experienced severe pain when starting nursing. It wasn't due to thrush , but right from the beggining DD had a super strong suck, and ended up kind of 'creasing' my nipples and they were very blistered, cracked and bleeeding. I was in agony when BF, and cried everytime she nursed b/c i was in soo much pain. This was in the hospital, when she was only 2 days old. We ended up with an incedible pro-bF, nurse, and she got use a nipple shileld, helped me with positioning, and every feeding came by to help. I used the nippe shield from thursday till sunday and my nipples had healed. We are now BF without it, and DD is a champ nurser. ..she is 3 weeks old.I would very much consider a nipple shiled if i were you until you can get a perfect latch, and thrush issues are gone. It is better than giving up on breastfeeding totally right? The thing is, your milk supply *may* decrease, so you should make sure to feed every 2-2.5 hours..it is soo worth it if you stick it out. I almsot gave up, and didnt, and now im sooo thankful i didnt..i love nursing my DD now... i also second the lanisoh, and ibuprofen...for every feeding.
Trust me, when u get over this (and you WILL) you will be grateful you stuck with it.