oh honney (((Hugs))) haven't read all the messages, but please remember around now your milk will be coming in - this means both you and baby will get stressed out - kai gas he won't get his delicioius milk from his mummy and you becasue kai will be frustrated and your hormones will be chanign with the milk, it's all perfectly normal, and with any luck should only last a few days before you both get settled down into things.
unfortunaltly hon your nipples will hurt for a few weeks - all I can suggest there is loads of cream - we were going thru 3 tubes a month, and lots of pads, apply and change after every feed.
get some nipple sheilds, and get your m/w to check his latch - I couldn't feed joey accross my tummy till he was nigh on 16 weeks - until then it had to be the rugby hold - ask your m/w to show you.
everything you're saying is perfectly normal - right down to the DH taking kai for a little while. and as for the sleeping thing - well have you tried co sleeping? at this stage I would advise against the formula if you want to keep BF - I asked my M/W the same thing when J was 4 days old - can I express/bottle feed so DH can feel involved - she said to me, if DH want's to feel involved you feed then pass baby to DH so he changes, winds soothes etc whilst you rest and get sleep - so basically girl, eat feed and sleep yourself let your DH do everything else - asnd I mean everything else. I know how wlovely it is to be doing things with kai as well but for the next few days you will need to have some rest as well
you are not a failiure you're doing real well, we've all been there with this, and if kai likes sleeping on you - please let him - remember you comfort him, you are all he knows, until 4 days ago he had a lovely warm protected environment now he's learning as much as you.
chin up hon, this stage will pass I promise you
please talk to your m/w as well they're there to help.
ooh and finally b4 I burn t, do you swaddle? try swaddaling might help to make Kai feel more secure